If legitimate emails are landing in spam, a deliverability consultant should identify the cause before recommending a fix. That means checking authentication, sending infrastructure, recipient and complaint patterns, and provider-specific responses—not simply rewriting a subject line or moving to another email platform. You can start with a structured review yourself; hire specialist help when the cause is unclear, the problem persists, or changes affect several sending systems.
Why are my emails going to spam?
Spam placement is usually a diagnosis problem, not a verdict on how an email looks. Mailbox providers assess signals that can include domain authentication, sending IP and hostname configuration, volume patterns, recipient engagement, complaints, list practices, and the message itself. A message can be accepted by a provider and still appear in spam; it can also be deferred or rejected, which points to a different problem.
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Start by defining the scope: which recipient providers are affected, which message types (such as receipts, password resets, or newsletters) are involved, when the issue began, and whether the messages are rejected, deferred, or delivered to spam. Recent changes to DNS, an email platform, sending IP, list source, or sending volume can help narrow the investigation. A single inbox test or a change in open rates is not enough to establish the cause.
What Google’s Gmail rules establish
Google’s requirements below apply to personal Gmail accounts, not necessarily Google Workspace inbound or intra-domain mail, and should not be treated as rules for every mailbox provider. Google defines a bulk sender as one sending close to 5,000 or more messages to personal Gmail accounts within 24 hours. Messages from subdomains count toward the same primary domain, and Google says bulk classification is permanent. See Google’s sender FAQ.
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| Personal Gmail sender scope | Google requirement or guidance |
|---|---|
| All senders | Use SPF or DKIM; maintain valid forward and reverse DNS for sending domains or IPs, TLS, and RFC 5322-compliant message formatting. Keep user-reported spam rates below 0.3%. |
| Bulk senders (close to 5,000 or more messages per 24 hours) | Use SPF and DKIM, publish a DMARC record, and align the visible From domain with SPF or DKIM for direct mail. Marketing and subscribed messages need one-click unsubscribe. Google recommends organizational-level alignment for SPF and DKIM and recommends setting up all three authentication mechanisms. |
| Spam-rate guidance | Google advises keeping the user-reported spam rate below 0.1% and preventing it from reaching 0.3% or higher. Bulk senders above 0.3% are ineligible for mitigation while above the threshold; according to Google’s FAQ, eligibility returns after the rate remains below it for seven consecutive days. |
These percentages and thresholds are Google’s figures, not universal industry limits. Google says enforcement is gradual and progressive; its FAQ states that enforcement ramp-up for noncompliant traffic began in November 2025. Noncompliant messages may be temporarily or permanently rejected, or sent to spam. Because requirements and enforcement can change, check Google’s current sender FAQ and sender guidelines when investigating Gmail delivery.
How do I fix emails going to spam?
Work from evidence toward changes. Avoid changing several systems at once: if delivery shifts afterward, it becomes harder to tell which change mattered. Use this sequence to organize a self-review or the first conversation with a consultant.
- Define the failure. Record affected recipient providers, message types, the start date, and whether messages are rejected, deferred, or accepted into spam. Separate transactional messages from marketing or subscription mail.
- Collect delivery evidence. Save full message headers, SMTP response codes, authentication results, provider error notices, and available domain or IP reputation and complaint data. Note the date range and sample size for each trend rather than treating one message as representative.
- Check authentication and DNS. Confirm SPF authorizes every system sending for the domain, including third-party platforms; verify DKIM signing and key configuration for each; and inspect the DMARC record, reporting, policy, and alignment between the visible From domain and authenticated domains. Also check sending-domain or IP forward and reverse DNS, TLS, and message formatting.
- Review lists and recipient controls. Examine where addresses came from, how consent was obtained, bounce handling, suppression lists, complaint trends, and how easy it is to unsubscribe. For marketing and subscribed messages sent to Gmail, check one-click unsubscribe headers as well as a visible unsubscribe link in the message body.
- Review sending patterns and infrastructure. Look for sudden volume increases or inconsistent rates. Google recommends gradual increases, steady sending, and starting with engaged recipients. If you use a shared IP, other users’ activity can affect its reputation.
- Use provider diagnostics and verify changes. For Gmail traffic, Google Postmaster Tools provides data and diagnostics such as delivery errors, spam reports, and feedback loops; see Google’s Postmaster Tools FAQ. Record what changed, who owns it, how it will be verified, and when delivery and complaint trends will be reviewed.
Correct authentication on the sending domain used by a third-party email platform. Switching platforms without correcting DNS, list or consent practices, or reputation does not address those likely causes. If a fix requires DNS access, involve the person who administers the domain; if the evidence points to a platform-level configuration, ask that provider’s support team to review it.
What should an email deliverability audit include?
A useful audit connects evidence to prioritized actions. It should make clear what was inspected, which recipient providers and sending systems are in scope, what the findings support, and how each proposed change will be checked.
Rank #3
Technical and operational checks
- SPF coverage for every sending service, plus DKIM signing and key configuration for each platform.
- DMARC policy, reporting, and alignment between the visible From domain and authenticated domains.
- Sending IP and hostname forward/reverse DNS, TLS, and message-format problems.
- Marketing and subscription unsubscribe implementation, including one-click headers where required by Google for bulk senders.
- List source and consent, bounces, suppression, complaints, unsubscribe friction, and volume patterns.
- Provider-specific errors and diagnostic data, including Google Postmaster Tools for Gmail traffic.
- Shared-IP context where relevant, since other senders using the same IP can influence its reputation.
Deliverables that make the audit actionable
Ask for a written report that separates authentication and configuration defects from list quality, reputation, content, and provider-specific filtering. It should rank fixes by priority, name an owner for each change, state the evidence behind the recommendation, and specify a verification method and monitoring schedule. If multiple changes are needed, the plan should explain how they will be staged so the effect of each can be assessed.
Do I need an email deliverability consultant?
Not every spam-folder problem needs an outside specialist. Start with the person who controls the affected system: your domain administrator for DNS, your email service provider for platform configuration or sending errors, or your internal email owner for lists and sending practices. Consider an independent consultant when the failure spans multiple systems or providers, the evidence is difficult to interpret, or delivery problems continue after straightforward configuration fixes.
| Option | Best fit | Access and verification |
|---|---|---|
| Self-service review | A limited issue with an identifiable system or recent change. | Requires access to message headers, sending dashboards, and DNS or help from their administrators; verify against provider responses and ongoing trends. |
| Email service provider support | A platform setting, sending error, or platform-specific diagnostic. | Provider support can inspect its own service; it may not have visibility into your DNS ownership, other senders, or broader list practices. |
| Domain administrator | DNS, SPF, DKIM, DMARC, or hostname configuration changes. | Needs authority to manage the relevant DNS records; verify published records and authentication results in actual messages. |
| Independent consultant | A persistent, multi-factor, or multi-provider issue requiring an end-to-end diagnosis. | Needs access to representative headers, error responses, platform and reputation data, and relevant list and volume information; agree on the scope and verification plan before work begins. |
When evaluating a consultant, ask about experience with the recipient providers and sending systems involved, technical evidence they will review, list and consent expertise, written deliverables, measurement plan, scope, pricing, and references or case studies. Ask how they distinguish actual delivery outcomes from indirect indicators such as open rates or seed-test placement.
How can I tell whether a consultant is credible?
A credible consultant should be willing to examine actual message headers and SMTP responses, explain what the available evidence can and cannot establish, and distinguish configuration problems from reputation, list, content, or provider filtering. The engagement should end with prioritized remediation steps and a way to monitor the result—not just a set of unverified content suggestions.
Be cautious if someone guarantees inbox placement, recommends bypassing consent or making unsubscribe difficult, claims a subject line is certainly the sole cause without evidence, or proposes changing IPs or domains before diagnosing the problem. These are practical warning signs, not a formal certification standard. Google says it cannot guarantee that messages sent by email providers will pass Gmail’s spam filters, and it does not accept allowlist requests from email providers, as its sender guidelines explain.
Can someone guarantee inbox placement?
No consultant can credibly promise that every legitimate message will reach every recipient’s inbox. Providers make filtering decisions using their own systems and signals, and even Google does not guarantee that email providers’ messages will pass Gmail’s spam filters. A trustworthy engagement promises work within its control—an evidence-based diagnosis, documented changes, and monitoring—not a universal placement outcome.
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