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If legitimate emails are landing in spam, the fix depends on why: authentication, DNS, sending reputation, recipient complaints, list practices, message setup, or a mailbox provider’s filtering. A deliverability consultant should identify the cause with evidence and give you a prioritized repair and monitoring plan—not promise that every message will reach every inbox.
Why are my emails going to spam?
Spam placement is a symptom, not a diagnosis. A message can look professional and still fail authentication, come from a domain or IP with a poor reputation, reach recipients who did not expect it, or trigger provider-specific filtering. The same email may also be accepted by one provider and rejected or placed in spam by another.
Start by identifying the scope of the problem: which recipient providers and message types are affected, when it began, and whether messages are rejected, deferred, or accepted into spam. Recent DNS, email-platform, IP, domain, or list changes can help narrow the cause. Useful evidence includes complete message headers, SMTP response codes, authentication results, reputation and complaint trends, and the time period represented by those figures.
Google’s published requirements below apply to personal Gmail accounts. Google distinguishes those accounts from Google Workspace inbound and intra-domain messages; these rules should not be treated as a complete statement of Yahoo, Microsoft, or other providers’ requirements.
#1 Best Overall
What Gmail requires from senders
Google’s current sender guidance, reviewed in 2026, sets different requirements based on the mail sent to personal Gmail accounts. Google defines a bulk sender as one that sends close to 5,000 or more messages to personal Gmail accounts within a 24-hour period. Messages from subdomains count toward the same primary domain, and Google says a sender classified as bulk remains classified that way permanently.
| Sender scope | Google’s requirements for personal Gmail |
|---|---|
| All senders | SPF or DKIM; valid forward and reverse DNS for sending domains or IPs; TLS; RFC 5322-compliant message format; and user-reported spam rates kept below 0.3%. |
| Bulk senders | SPF and DKIM; a DMARC record; alignment of the visible From domain with SPF or DKIM for direct mail; and one-click unsubscribe for marketing and subscribed messages. |
Google recommends aligning SPF and DKIM at the organizational level and setting up all three authentication mechanisms. For spam rates, it advises senders to stay below 0.1% and prevent rates from reaching 0.3% or higher. These are Google figures, not universal thresholds. Google’s FAQ says bulk senders above 0.3% are ineligible for mitigation while they remain above the threshold, and regain eligibility after staying below it for seven consecutive days.
Google says enforcement is gradual and progressive. Its sender FAQ says ramp-up enforcement for noncompliant traffic began in November 2025; affected mail can be temporarily or permanently rejected, or delivered to spam. Requirements and enforcement can change, so consult Google’s Email sender guidelines FAQ and Email sender guidelines for current details.
What should an email deliverability audit include?
A useful audit connects technical configuration and sending behavior to the actual delivery symptoms. Ask the consultant to document the evidence, distinguish confirmed defects from possible causes, and explain how each proposed change will be verified.
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Authentication and sending infrastructure
- Check SPF authorization for every system that sends on your domain, including third-party platforms.
- Verify DKIM signing and key configuration for each sending platform, and review the DMARC record, reporting, policy, and alignment between the visible From domain and authenticated domains.
- Review sending IP and hostname forward and reverse DNS, TLS, and message-format problems.
- For marketing and subscription mail, check for compliant List-Unsubscribe headers supporting one-click unsubscribe, as well as a visible unsubscribe link in the message body.
Lists, sending patterns, and reputation
- Review how recipients joined the list, consent records, bounce handling, suppressions, complaint trends, and whether unsubscribing is difficult.
- Check whether sending volume is consistent or has increased abruptly. Google recommends gradual increases, steady rates, and starting with engaged recipients.
- Consider shared-IP effects where relevant: Google notes that the activity of other users on a shared IP can affect its reputation.
- Look at provider-specific delivery errors and available diagnostics. For Gmail traffic, Google Postmaster Tools can provide delivery-error, spam-report, and feedback-loop data; see its Sender requirements & Postmaster Tools FAQ.
Evidence and a usable repair plan
The audit should state which recipient providers and message types were sampled, the sampling period, and what the headers, SMTP responses, authentication results, dashboards, and complaint trends show. Its output should be a prioritized remediation plan that names an owner for each change, a verification method, and a monitoring schedule. Without those details, it is difficult to tell whether the recommendations address the observed problem or simply list common deliverability advice.
How do I fix emails going to spam?
Fixes should follow the evidence rather than begin with a subject-line change or a new sending platform. A practical sequence is:
- Define the failure. Record affected providers, message types, the start date, and whether mail is rejected, deferred, or accepted into spam. Gather representative full headers and SMTP responses.
- Check authentication and DNS. Confirm that every sending system is authorized and signing correctly, and review DMARC alignment, DNS, TLS, and message formatting against the requirements that apply to your recipients.
- Review recipient and list practices. Validate list sources and consent, remove or suppress addresses that should not receive mail, process bounces, and make unsubscribing straightforward.
- Stabilize sending behavior. Avoid sudden volume increases; use gradual increases and begin with engaged recipients, as Google recommends.
- Apply changes in a controlled way and measure them. Record each change, assign responsibility, and monitor provider-specific responses, spam reports, and delivery signals over a defined period.
Authentication changes may require the domain administrator; platform support may help verify a platform’s configuration; and a technically complex or persistent issue may warrant independent diagnosis. Changing email platforms without correcting DNS, list or consent practices, or sender reputation does not address those causes.
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Not every spam-folder problem needs an outside consultant. If the failure is a straightforward DNS or platform configuration issue and your team can verify the fix, your domain administrator or email-platform support may be enough. Consider an independent consultant when several sending systems or providers are involved, delivery has deteriorated without a clear cause, reputation or complaint patterns need interpretation, or your team needs a documented audit and staged remediation plan.
| Option | Best fit | What to expect |
|---|---|---|
| Self-service checks | A clear, limited issue your team can investigate. | Your team gathers evidence and makes changes; this may be insufficient when multiple causes or providers are involved. |
| Email-platform support | A question about that platform’s authentication setup or delivery errors. | Help focused on the platform; it may not resolve domain-wide reputation or list-practice issues. |
| Domain administrator | DNS, authentication-record, or related domain changes. | Access to make configuration changes; diagnosis may still require evidence across platforms and providers. |
| Independent consultant | A persistent, complex, or multi-provider problem requiring an outside diagnosis. | Look for a written audit, prioritized changes, verification criteria, and monitoring plan; scope and pricing depend on the engagement. |
How to evaluate an email deliverability consultant
Choose based on the consultant’s ability to investigate your actual sending systems and explain what the evidence supports. Compare relevant provider experience, depth of technical diagnosis, list and consent expertise, written deliverables, measurement plan, scope and pricing clarity, and references or case studies that avoid unrealistic promises.
- Will they inspect full message headers and SMTP responses, rather than rely only on inbox-placement seed tests or open rates?
- Will the written audit separate authentication and configuration defects from list quality, reputation, content, and provider-specific filtering?
- How will changes be staged and measured, and which recipient providers and sending systems are in scope?
- What are the deliverables, access requirements, project limits, and monitoring period?
Warning signs include guaranteed inbox placement, advice to bypass consent or remove unsubscribe options, an unsupported claim that one subject line is the sole cause, or a proposed IP or domain switch without a diagnosis. These are practical evaluation criteria, not a formal certification rubric. Google states that it does not accept allowlist requests from email providers, reinforcing that there is no simple route to guaranteed acceptance: Google’s sender guidelines.
Can someone guarantee inbox placement?
No consultant can credibly guarantee that every message will land in every recipient’s inbox. Mailbox providers make filtering decisions using provider-specific systems, and sender behavior and reputation can change. Google itself says it cannot guarantee that messages sent by email providers will pass Gmail’s spam filters. A credible engagement can promise defined work—such as an evidence-backed audit, implementation support, and monitoring—but not universal placement.
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