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To run Postfix safely on a Linux VPS, establish the server’s hostname and DNS first, choose whether the machine will deliver mail directly or relay through another SMTP service, then install Postfix and lock down its identity, relay permissions, TLS, authentication, and firewall. A send-only server can be relatively small; a VPS that also stores mailboxes needs additional delivery and mailbox software.
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This guide uses Debian and Ubuntu conventions. Substitute your real domain for example.com and the server name for mail.example.com. The commands assume an account with sudo access.
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Decide what the VPS must do
Postfix is an SMTP mail-transfer agent (MTA). It accepts messages from local applications or authenticated clients, places them in a queue, and either delivers them to recipient servers or forwards them to an upstream SMTP relay. It does not, by itself, provide a complete mailbox service with IMAP or POP3 access.
| Deployment | How mail leaves the VPS | What you must operate |
|---|---|---|
| Direct Internet delivery | Postfix connects to recipient domains’ MX servers, normally over TCP port 25. | DNS, reverse DNS, TLS, sender authentication records, reputation, queue monitoring, and compliance with the VPS provider’s SMTP policy. |
| Upstream relay | Postfix hands mail to a relay service that performs onward delivery. | Relay credentials, the provider’s required TLS and authentication settings, and the relay’s sender and recipient policies. Port-25 reputation work is reduced, but the upstream service becomes a delivery dependency. |
| Send-only application server | Local applications submit messages to Postfix; Postfix delivers directly or uses a relay. | Usually no local user mailboxes. Keep relay permissions limited to the server itself or authenticated submission clients. |
| Mailbox server | Postfix receives and routes mail for local users, while a separate delivery and access stack stores and serves it. | An MDA and an IMAP/POP3 service in addition to Postfix, plus mailbox storage, quotas, filtering, and account management. |
Choose the role before installation. The Debian/Ubuntu package dialog presents an Internet Site option for direct delivery and relay-oriented choices when another SMTP system will deliver the mail. Selecting the wrong role is recoverable, but it can leave identity, destination, and relay settings inconsistent.
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Complete the VPS and DNS prerequisites
Set a fully qualified hostname
Give the VPS a stable fully qualified domain name (FQDN), such as mail.example.com. The hostname should resolve to the VPS address and should be the name used in the SMTP greeting and certificate.
- Set the system hostname with your distribution’s supported hostname mechanism, then confirm it with
hostname --fqdn. - Add matching local name resolution in
/etc/hostsif your operating-system setup requires it. Keep the canonical FQDN associated with the VPS address. - Reopen your shell or restart services that cached the old hostname.
Publish forward and mail records
In the authoritative DNS zone, publish an A record for an IPv4 address and an AAAA record only when IPv6 is correctly routed and configured. For a receiving domain, publish an MX record pointing to the mail host, not directly to an address. A send-only host may not need an MX record for its own domain, but the domain’s sending and return-path design still needs to be intentional.
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Check the provider’s network policy
Ask whether outbound TCP port 25 is blocked, rate-limited, or subject to an approval process. If direct delivery is unavailable, configure an upstream relay instead of trying to bypass the restriction. Keep the provider’s acceptable-use rules and abuse-contact requirements accessible for troubleshooting.
Prepare sender-authentication DNS
For the domain that appears in your envelope and message headers, plan SPF, DKIM, and DMARC records. Postfix can send mail without all three, but receiving systems increasingly evaluate them together. DKIM signing normally requires a separate signing component; it is not supplied by a basic Postfix installation.
Install Postfix on Ubuntu or Debian
Update package metadata and install the package:
sudo apt update
sudo apt install postfixDuring the package configuration dialog, select the role matching your design. For direct server-to-server delivery choose Internet Site. For an upstream SMTP service, choose the relay-oriented setup and provide the relay host when prompted. The dialog may ask for the system mail name, destination domains, network ranges, local usernames, and mailbox format. Record each answer; these values become part of /etc/postfix/main.cf.
After installation, verify that the service is enabled and running:
systemctl status postfix
sudo systemctl enable postfixIf the dialog was skipped or needs to be repeated, Debian-family systems provide:
sudo dpkg-reconfigure postfixUnderstand Postfix’s configuration files
The Postfix project identifies main.cf and master.cf as its two most important files.
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/etc/postfix/main.cfcontains site-wide parameters: identity, destinations, network trust, TLS, SASL, queues, and restrictions./etc/postfix/master.cfdefines daemon services and listener behavior, including submission services. A service line beginning with#is disabled.
Use postconf for controlled edits and inspection instead of repeatedly rewriting files with ad-hoc scripts. Back up a working configuration before major changes:
sudo cp -a /etc/postfix/main.cf /etc/postfix/main.cf.backup
sudo cp -a /etc/postfix/master.cf /etc/postfix/master.cf.backupDisplay only non-default settings with:
postconf -nPostfix configuration files should remain owned by root and readable only as needed. Protect files containing private keys or relay passwords; do not paste secrets into tickets or shell history. After editing, validate and apply changes:
sudo postfix check
sudo systemctl reload postfixUse a full restart when changing a service definition or when a reload does not replace a running listener:
sudo systemctl restart postfixSet identity, destinations, and trust boundaries
The following parameters determine who the server is, which addresses it accepts, and which clients it trusts:
| Parameter | Purpose | Typical consideration |
|---|---|---|
myhostname |
The server’s FQDN and usual SMTP identity. | Use the name with matching forward and reverse DNS, for example mail.example.com. |
mydomain |
The parent domain used by other Postfix defaults. | Set it deliberately when the system hostname alone does not produce the intended domain. |
myorigin |
The domain appended to locally generated mail. | Choose whether local system mail should appear from the host domain or the organization’s mail domain. |
mydestination |
Domains Postfix treats as locally delivered. | List only domains whose mail this server is genuinely responsible for. Do not add every domain you send from. |
inet_interfaces |
Addresses on which Postfix listens. | Use all only when every configured interface should accept SMTP; a send-only host can listen more narrowly. |
mynetworks |
Networks trusted to relay without SASL. | Keep this list narrow: loopback and explicitly controlled application addresses, never an entire public range. |
Inspect current values and set explicit values with commands such as:
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postconf myhostname mydomain myorigin mydestination inet_interfaces mynetworks
sudo postconf -e 'myhostname = mail.example.com'
sudo postconf -e 'mydomain = example.com'
sudo postconf -e 'myorigin = $mydomain'
sudo postconf -e 'mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain'
sudo postconf -e 'inet_interfaces = all'
sudo postconf -e 'mynetworks = 127.0.0.0/8 [::1]/128'Adjust the destination list for your actual role. A send-only machine should not accept mail for domains it does not host. If IPv6 is enabled, include only IPv6 ranges you control.
Prevent an open relay
Relay restrictions must require either a trusted network or successful authentication. Keep recipient restrictions enabled and review them after every package or configuration change. A baseline for a host that relays only for local applications is:
sudo postconf -e 'smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination'
sudo postconf -e 'smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination'The exact restriction set may differ with your Postfix release and policy, but the essential rule is unchanged: unauthenticated clients on untrusted networks must not relay to arbitrary external recipients. Never test relay behavior against real third parties until you have verified the restriction order.
Choose local delivery or send-only operation
Postfix can deliver to local Unix users, but local delivery is not the same as a user-facing mailbox service. Ubuntu documents Maildir as an alternative format:
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sudo postconf -e 'home_mailbox = Maildir/'With that setting, locally delivered messages are placed under each user’s home directory in Maildir structure. Users still need a mail access service such as IMAP or POP3, and a complete mailbox deployment also needs account controls, storage permissions, filtering, and a delivery agent. Those components are outside a Postfix-only send-only setup.
For a send-only application host, avoid creating unnecessary local destinations. Configure the application to submit locally over loopback or to use authenticated submission, and keep local mailbox delivery disabled unless it is required for system notifications.
Configure TLS correctly
TLS protects SMTP traffic and SASL credentials. Obtain a certificate whose subject or subject-alternative name matches the hostname clients use, such as mail.example.com. Store the private key with restrictive ownership and permissions, and arrange renewal before expiration.
Server-side TLS settings
Point Postfix to the certificate and key, then choose a security level appropriate to the service:
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sudo postconf -e 'smtpd_tls_key_file = /etc/ssl/mail/mail.example.com/privkey.pem'
sudo postconf -e 'smtpd_tls_security_level = may'
sudo postconf -e 'smtpd_tls_auth_only = yes'may advertises STARTTLS when available without refusing every remote server that lacks TLS. Requiring TLS for all inbound Internet delivery can prevent legitimate mail because remote domains may not support it. For authenticated submission, require encryption before authentication by enabling TLS on the submission service and using smtpd_tls_auth_only = yes.
Client-side TLS for outbound delivery
For direct delivery, Postfix is the SMTP client. A common interoperability setting is opportunistic TLS:
sudo postconf -e 'smtp_tls_security_level = may'
sudo postconf -e 'smtp_tls_loglevel = 1'When an upstream relay requires encryption, set the client policy to the level required by that provider and verify the relay’s certificate name. Do not apply a mandatory TLS policy globally unless every destination is known to support it; use destination-specific policies when only selected relays require strict encryption.
Protect the key and confirm STARTTLS
Limit the private-key file to the account and group that need it, then reload Postfix after renewal. From a controlled workstation, inspect the SMTP greeting and STARTTLS negotiation:
openssl s_client -starttls smtp -connect mail.example.com:25 -servername mail.example.com
openssl s_client -starttls smtp -connect mail.example.com:587 -servername mail.example.comCheck that the presented certificate matches the hostname, chains to a trusted authority, and has not expired. A successful TLS handshake does not prove that authentication or relay authorization is configured correctly; test those separately.
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Enable authenticated submission with SASL
SMTP-AUTH lets a client identify itself through a SASL mechanism, with TLS protecting the authentication exchange. Postfix supports Cyrus SASL and Dovecot SASL. Choose the backend that fits the rest of your mail stack; Dovecot SASL is a natural choice when Dovecot already provides mailbox access, while Cyrus SASL may fit an existing Cyrus deployment.
Use Dovecot SASL
Install and configure Dovecot’s authentication service so it exposes a Unix socket that Postfix can access. The socket path and group must match on both sides. Then configure Postfix:
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sudo postconf -e 'smtpd_sasl_auth_enable = yes'
sudo postconf -e 'smtpd_sasl_type = dovecot'
sudo postconf -e 'smtpd_sasl_path = private/auth'
sudo postconf -e 'smtpd_sasl_security_options = noanonymous'
sudo postconf -e 'smtpd_sasl_local_domain = $myhostname'
sudo postconf -e 'broken_sasl_auth_clients = yes'The Dovecot socket must be reachable by the Postfix process, and Dovecot must offer only mechanisms appropriate for your TLS policy. Never enable anonymous authentication for public submission.
Use Cyrus SASL
With Cyrus SASL, install the mechanism packages required by your distribution, configure the SASL service name and authentication database, and point Postfix at the resulting SASL implementation. The precise package names and database configuration vary by Debian or Ubuntu release, so verify the installed module names locally before enabling a mechanism.
Expose a submission service on port 587
In /etc/postfix/master.cf, enable the submission service and apply settings that require TLS and authentication. A typical service block is:
submission inet n - y - - smtpd
-o smtpd_tls_security_level=encrypt
-o smtpd_sasl_auth_enable=yes
-o smtpd_tls_auth_only=yes
-o smtpd_relay_restrictions=permit_sasl_authenticated,rejectThe exact spacing is not significant, but each continuation line must remain associated with the submission service. Reload Postfix and confirm that it is listening on port 587. Authenticated clients should submit there rather than sending credentials over the general port-25 listener.
Use port 465 only when configured for implicit TLS
Port 465 is appropriate only when you deliberately configure an implicit-TLS submission service and your clients require it. It is not interchangeable with STARTTLS on port 587. Do not open port 465 merely because it is conventional; enable and test the service explicitly.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Configure an upstream relay when direct delivery is unsuitable
An upstream relay is useful when the provider blocks port 25, when you do not want to manage direct-delivery reputation, or when organizational policy centralizes outbound mail. Set the relay host and, if required, credentials:
sudo postconf -e 'relayhost = [smtp.relay.example]:587'
sudo postconf -e 'smtp_sasl_auth_enable = yes'
sudo postconf -e 'smtp_sasl_security_options = noanonymous'
sudo postconf -e 'smtp_tls_security_level = encrypt'
sudo postconf -e 'smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd'Create the password map with the relay’s exact hostname and credentials, protect the source file, compile the database, and remove accidental world-readable permissions:
sudo chmod 600 /etc/postfix/sasl_passwd
sudo postmap /etc/postfix/sasl_passwd
sudo chmod 600 /etc/postfix/sasl_passwd.db
sudo postfix check
sudo systemctl reload postfixUse the relay provider’s required certificate policy, username format, sender restrictions, and port. Do not publish or reuse credentials in application configuration when local submission can centralize them safely.
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At the VPS firewall and any cloud security group, allow only required traffic:
| Port | Purpose | When to open it |
|---|---|---|
| 25/TCP | Server-to-server SMTP and, on some designs, unencrypted-to-STARTTLS inbound SMTP. | Open for direct delivery or inbound mail. Provider policy may block outbound use even when inbound access is allowed. |
| 587/TCP | Authenticated message submission with STARTTLS. | Open when applications or users submit from networks outside the trusted local range. |
| 465/TCP | Authenticated submission with implicit TLS. | Open only when that service is explicitly configured and required by clients. |
Keep SSH access restricted separately. Do not expose administrative services on the mail interface, and do not assume that a listening Postfix port is safe merely because authentication is enabled elsewhere.
Verify the installation in layers
Validate configuration and service state
- Review effective non-default settings:
postconf -n. - Run the built-in consistency check:
sudo postfix check. Correct every reported permission, directory, or syntax problem. - Check the unit:
systemctl status postfix. - Confirm listeners with your operating system’s socket tool, then compare them with the ports you intended to expose.
Submit a controlled test message
Send a message from a local application or an SMTP client to an address you control. Watch the mail log in another terminal while submitting. On many Debian and Ubuntu systems the log is in /var/log/mail.log; systems using only the journal can be followed with:
sudo journalctl -u postfix -fCheck the queue immediately afterward:
postqueue -pA successful delivery removes the message from the active queue and produces a delivery status in the log. A queued message is not proof of failure; it means Postfix is waiting for a retry or a correction.
Test submission authentication
Connect to port 587 with an SMTP client that supports AUTH and STARTTLS. Confirm that the server advertises STARTTLS, refuses authentication before encryption when your policy requires it, accepts valid credentials, and rejects invalid credentials. Then verify that an authenticated client can relay while an unauthenticated Internet client cannot.
Test externally
Deliver to controlled recipients at more than one external domain. Inspect the complete headers for the sending host, TLS use, SPF alignment, DKIM signature when a signer is installed, and DMARC results. Test both IPv4 and IPv6 if both are published; an unusable IPv6 path can cause inconsistent delivery when an AAAA record exists.
Read queue and SMTP errors correctly
4xx responses: temporary deferral
A 4xx SMTP response means the remote system or a local policy has deferred delivery. Leave the message queued while you investigate the log, DNS, network reachability, rate limits, and the remote response. Repeated deferrals can eventually produce a bounce after Postfix’s retry and expiration policy is exhausted.
5xx responses: permanent rejection
A 5xx response is treated as a permanent failure until the cause is corrected. Common causes include an invalid recipient, missing or mismatched DNS, a rejected sender domain, authentication failure at the relay, policy blocks, or a certificate-name problem. Fix the underlying issue before forcing repeated retries; retrying unchanged mail can worsen reputation and logs.
Useful queue operations
postqueue -p
sudo postqueue -f
sudo postsuper -d QUEUE_IDUse postqueue -f only after correcting a temporary problem or changing delivery conditions. Delete a message with postsuper -d only when you have confirmed its queue ID and intend to discard it. Preserve the log entry before deletion if you need an audit trail.
Quick Recap
Common failure patterns and fixes
- Host-name mismatch:
myhostname, forward DNS, PTR, and the certificate name differ. Choose one canonical FQDN and align all four. - Relay denied: the client is neither in
mynetworksnor authenticated, or the submission service is not using the intended restrictions. Test on port 587 with valid credentials rather than broadening trust. - Open-relay risk:
mynetworkscontains a public network or recipient restrictions permit unauthenticated destinations. Narrow the network list immediately, reload, and test from an untrusted connection. - Authentication unavailable: the Dovecot or Cyrus socket, service name, permissions, or mechanism packages do not match Postfix. Check the SASL service log and the socket path before changing relay rules.
- TLS handshake failure: the certificate is expired, the name does not match, the chain is incomplete, the private key is unreadable, or the client and server share no protocol or cipher. Validate with
openssl s_clientand inspect the log. - Messages remain queued: inspect the recipient’s latest SMTP response, DNS lookups, firewall egress, provider port-25 policy, and the retry schedule. Do not treat a full queue as a single diagnosis.
- Local mail disappears from the expected place: confirm
home_mailbox, local delivery permissions, and whether an MDA or mailbox service is installed. Postfix alone does not create an IMAP-accessible mailbox.
Operational checklist before production use
- The VPS has a stable FQDN, matching forward and reverse DNS, and a certificate for the name clients use.
- The intended direct-delivery or upstream-relay role is documented and reflected in the package configuration.
mydestination,inet_interfaces, andmynetworkscontain only required values.- Relay restrictions reject unauthenticated external recipients, and an open-relay test has failed as expected.
- Port 587 authentication requires TLS; port 465 is enabled only when explicitly configured.
- SPF, DKIM, and DMARC are published or deliberately scheduled for the sending domain.
- The VPS firewall and provider security group expose only required SMTP ports.
postfix check,postconf -n, service status, queue inspection, TLS negotiation, authenticated submission, and external delivery tests all pass.- Log retention, queue monitoring, certificate renewal, and a procedure for handling 4xx and 5xx responses are in place.
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