Email Deliverability Solution

Fix Email Deliverability Issues

Email delivery problems are often caused by DNS, authentication, reputation or mail server configuration issues. Diagnose SPF, DKIM, DMARC, MX, reverse DNS and blacklist problems before they affect your sending domain.

Get Help Check Email Health

Technical DNS and mail-server configuration help for domains, hosting email and VPS mail setups.

SPF • DKIM • DMARC • MX • Reverse DNS • Blacklist

When you need this

Use this page if your emails are delayed, rejected, unauthenticated or landing in spam.

  • Emails go to spam
  • SPF, DKIM or DMARC fail
  • Domain or IP appears on a blacklist
  • Mail server IP has missing reverse DNS
  • Google or Microsoft rejects messages
  • Email provider or hosting was recently changed

Recommended diagnostic path

Start broad, then narrow down the exact email delivery issue.

  1. Run a full email health check

    Start with the Domain Health Checker to review DNS, email authentication, SSL, reputation and website signals.

    Run Domain Health Check →

  2. Validate authentication

    Check SPF, DKIM and DMARC records for missing, weak or misconfigured policies.

    SPF CheckerDKIM CheckerDMARC Checker

  3. Review mail routing and server identity

    Check MX records and reverse DNS to confirm mail routing and sending IP identity.

    MX LookupReverse DNS Checker

  4. Check reputation signals

    Review blacklist status and provider results before requesting delisting.

    Blacklist Checker

What hands-on help can cover

If the report shows email authentication, routing, reverse DNS or reputation issues, we can review SPF, DKIM, DMARC, MX, PTR and blacklist signals and route the request if support is needed.

  • SPF, DKIM and DMARC configuration
  • MX and mail routing review
  • Reverse DNS / PTR setup
  • Blacklist and reputation troubleshooting
  • Hosting, VPS and mail server support
Get Help

Common email deliverability problems

SPF record problems

Broken SPF can fail authentication and hurt sender trust with major inbox providers.

DKIM not configured

Missing DKIM means receivers cannot verify message integrity or sender identity.

DMARC policy too weak

Weak DMARC leaves spoofing risk and limits protection for your domain.

MX or mail routing issues

Incorrect MX records can block inbound mail or send it to the wrong host.

Reverse DNS mismatch

Missing PTR records on sending IPs can trigger spam filters and reduce trust.

Blacklist listings

A listed IP or domain can cause bounces or spam-folder delivery until resolved.

Technical review areas

  • Authentication SPF, DKIM, DMARC
  • Mail routing MX, provider, host resolution
  • Reputation & identity Blacklist, rDNS, PTR

Choose how you want to fix it

DIY diagnosis

Use the free tools to identify issues and copy recommended DNS records.

Run Email Health Check

Assisted configuration

Get help reviewing DNS, mail server settings, reverse DNS and reputation issues.

Get Help

How the fix process works

From diagnosis to DNS changes and verification.

  1. Diagnose

    Run the diagnostic path to find SPF, DKIM, DMARC, MX, reverse DNS or blacklist issues.

  2. Apply DNS and server changes

    Update DNS records, mail server settings or ask your provider to apply the recommended fixes.

  3. Recheck after propagation

    Verify results again once DNS and server changes have had time to propagate.

DNS changes may take time to propagate depending on TTL and provider settings.

Example email deliverability action plan

A typical fix plan may include several DNS and mail server updates.

Priority 1

Fix SPF syntax

Recommended fix: Publish a single valid SPF record with authorized senders.

Priority 2

Enable DKIM signing

Recommended fix: Add the DKIM public key record and enable signing in your mail system.

Priority 3

Review DMARC policy

Recommended fix: Monitor with p=none first, then tighten to quarantine or reject once SPF and DKIM are stable.

Priority 4

Configure reverse DNS

Recommended fix: Ask your hosting provider to set PTR records for sending IPs.

Priority 5

Review blacklist status

Recommended fix: Fix the root cause before requesting delisting.

These checks improve technical configuration, but they do not guarantee inbox placement.

Need help fixing email deliverability?

Submit your domain, report link or issue details. We’ll review SPF, DKIM, DMARC, MX, reverse DNS and blacklist signals and route the request if hands-on support is needed.

Get Help Run Domain Health Check

Frequently asked questions

Missing or incorrect SPF, DKIM, DMARC, MX, reverse DNS issues, blacklist listings and poor sending reputation are common causes.
No. SPF, DKIM and DMARC improve authentication, but inbox placement also depends on reputation, content and receiver filtering.
SPF is a DNS record that lists which servers may send email for your domain.
DKIM adds a cryptographic signature so receivers can verify a message was not altered in transit.
DMARC tells receivers how to handle messages that fail SPF or DKIM and can send reports to domain owners.
Many mail systems check PTR records on sending IPs. Missing or mismatched reverse DNS can reduce mail server trust.
Yes. we can help with DNS, mail server setup, email authentication, reverse DNS and hosting-related email configuration.