Free tools Windows power users keep installed
One-click scans. No signup required.
First find out whose Spam or Junk folder is involved. If a message you receive is misplaced, adjust that mailbox’s settings. If messages you send land in other people’s Spam folders, investigate your sending domain, authentication, sending practices, and delivery diagnostics. A recipient-side fix can help one person; it cannot repair a sender’s domain reputation or authentication.
Start by identifying where the problem happens
“Why are my emails going to spam?” can describe two different problems: a legitimate message you receive is filtered into your Spam or Junk folder, or a message you send is filtered by recipients’ providers. Identify the direction, the provider, and the scope before changing settings.
As an Amazon Associate I earn from qualifying purchases.
- One incoming sender, one mailbox: check that mailbox’s Spam or Junk controls.
- Your outgoing mail, many recipients: investigate authentication, sending behavior, and provider diagnostics for your domain.
- Only forwarded messages: forwarding may affect authentication, so compare forwarded delivery with direct delivery.
- Work or school account: organization-level filtering may override user settings.
There is no established ranking of how often each cause puts ordinary users’ mail in Spam. The checks below distinguish likely recipient-side controls from sender-side delivery problems without assuming a cause from a single report.
If a legitimate message you receive lands in Gmail Spam
- Open Gmail’s Spam folder and open the legitimate message.
- Select Not spam. Google says removing a message from Spam this way prevents future mail from that sender from going to Spam.
- If the same sender’s messages are still misplaced, add the sender to Google Contacts or create a filter for that sender and select Never send it to Spam.
These steps affect your mailbox and that sender; they do not fix the sender’s delivery to other people. Gmail may show a warning explaining why it classified a message as spam. If the message looks suspicious or you cannot verify the sender, do not whitelist it.
#1 Best Overall
- SonicWall Comprehensive Anti-Spam Service for TZ270 - 1 Year License (02-SSC-6673)
- Advanced Spam & Phishing Filtering: Blocks unwanted emails, phishing attempts, and spoofed messages before they reach users.
- Real-Time IP Reputation & Cloud Lookups: Uses SonicWall’s threat intelligence network to identify and block known spammers and malicious domains.
- Integrated with SonicWall Appliances: Runs natively on SonicWall firewalls and Email Security appliances with no additional hardware required.
- Email Continuity & Clean-Up Tools: Reduces email server load and ensures clean, filtered mail delivery to help protect business productivity.
If a legitimate message you receive lands in Outlook Junk
Check the account’s junk-email settings and confirm that the sender’s address or domain is not on the blocked list. Add a trusted sender to Safe Senders; Microsoft says messages from safe senders are not moved to Junk by Outlook’s filter. Blocked addresses or domains are directed to Junk.
Outlook settings vary by product and account. In a work or school mailbox, administrator or server-side filtering may act before your personal settings. If changing the list does not help, ask your organization’s administrator to check its filtering rules.
If messages you send land in recipients’ Spam folders
Check domain authentication and alignment
For mail sent to personal Gmail accounts, Google requires all senders to configure SPF or DKIM. Senders who send more than 5,000 messages per day to Gmail accounts must configure both SPF and DKIM and publish DMARC. Google recommends SPF, DKIM, and DMARC for sending domains more generally. These Gmail requirements should not be treated as identical rules for every mailbox provider.
Rank #2
- SonicWall Comprehensive Anti-Spam Service for TZ270 - 2 Year License (02-SSC-6674)
- Advanced Spam & Phishing Filtering: Blocks unwanted emails, phishing attempts, and spoofed messages before they reach users.
- Real-Time IP Reputation & Cloud Lookups: Uses SonicWall’s threat intelligence network to identify and block known spammers and malicious domains.
- Integrated with SonicWall Appliances: Runs natively on SonicWall firewalls and Email Security appliances with no additional hardware required.
- Email Continuity & Clean-Up Tools: Reduces email server load and ensures clean, filtered mail delivery to help protect business productivity.
Check that every service authorized to send mail for your domain is included in your authentication setup. Where DMARC alignment applies, the visible From domain needs to align with an authenticated SPF or DKIM domain. A message may appear to come from your domain even though the service that sent it was not configured correctly.
Check delivery requirements and the actual error
Google’s guidance for mail to personal Gmail accounts also covers valid forward and reverse DNS (PTR), TLS, and RFC 5322 message formatting. For bulk senders, it specifies aligned authentication and one-click unsubscribe plus a visible unsubscribe link for marketing and subscribed messages.
Look at bounce notices and SMTP errors for a concrete failure. A recipient’s report that a message went to Spam does not, by itself, identify whether authentication, formatting, reputation, or a recipient-side rule caused it.
Rank #3
- SonicWall Comprehensive Anti-Spam Service for TZ270W - 1 Year License (02-SSC-6679)
- Advanced Spam & Phishing Filtering: Blocks unwanted emails, phishing attempts, and spoofed messages before they reach users.
- Real-Time IP Reputation & Cloud Lookups: Uses SonicWall’s threat intelligence network to identify and block known spammers and malicious domains.
- Integrated with SonicWall Appliances: Runs natively on SonicWall firewalls and Email Security appliances with no additional hardware required.
- Email Continuity & Clean-Up Tools: Reduces email server load and ensures clean, filtered mail delivery to help protect business productivity.
Review consent, volume, and recipient response
Google advises sending only messages recipients expect and have opted in to receive, using a reasonable volume, providing unsubscribe mechanisms where required, and honoring unsubscribe requests. Correct authentication alone does not make unwanted mail welcome.
For mail to personal Gmail accounts, Google says senders should keep their spam rate below 0.3%. This is Google’s sender-side guidance, not a general statistic about how much email goes to Spam or a guaranteed inbox-placement cutoff for any one message.
Use Gmail’s sender diagnostics
Gmail Postmaster Tools provides information about spam rate, reputation, authentication, and delivery errors for outgoing mail sent to personal Gmail accounts. Google notes that readings may be incomplete on low-volume days, so an empty or missing reading is not proof that delivery is healthy. Google also says senders typically achieve DKIM and DMARC success rates of 95% or higher when those methods are set up correctly; that figure describes authentication dashboard results, not inbox delivery.
Rank #4
- SonicWall Comprehensive Anti-Spam Service for TZ350 - 1 Year License (02-SSC-1809)
- Advanced Spam & Phishing Filtering: Blocks unwanted emails, phishing attempts, and spoofed messages before they reach users.
- Real-Time IP Reputation & Cloud Lookups: Uses SonicWall’s threat intelligence network to identify and block known spammers and malicious domains.
- Integrated with SonicWall Appliances: Runs natively on SonicWall firewalls and Email Security appliances with no additional hardware required.
- Email Continuity & Clean-Up Tools: Reduces email server load and ensures clean, filtered mail delivery to help protect business productivity.
Investigate forwarding and third-party senders
Forwarding can cause SPF to fail because the forwarding server, rather than the original sender, connects to the recipient. Changes to message content or signed headers can also invalidate DKIM. Google recommends DKIM as well as SPF and advises avoiding changes that break a DKIM signature. Include third-party email services in your domain’s authentication configuration, and compare direct delivery with forwarded or mailing-list delivery.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why one fix cannot guarantee inbox placement
Recipient providers control their own filters and policies. Authentication, appropriate sending practices, recipient settings, and diagnostic evidence can help narrow the problem, but no sender can guarantee that every provider will put every message in the inbox. Outlook’s safe-sender controls and Gmail’s sender requirements are different paths, and managed accounts may add another layer of filtering.
Recommended Free Tools
Quick Recap
A practical troubleshooting sequence
- Locate the affected folder and account. Determine whether this is incoming mail in your mailbox or outgoing mail reported as Spam by recipients.
- Limit the scope. Check whether one sender or recipient is affected, or whether reports span many recipients and providers.
- Apply the appropriate mailbox control. For a false positive, use Gmail’s Not spam or Outlook’s Safe Senders option, as applicable.
- For outgoing mail, inspect evidence. Check authentication and alignment, DNS, bounce messages, SMTP errors, and Gmail Postmaster Tools when sending to personal Gmail accounts.
- Check the route. Determine whether forwarding, a mailing list, or a third-party sending service changes the message or its authentication.
- Review recipient expectations. Confirm that recipients opted in, can unsubscribe where required, and are not receiving unexpected volume.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
