Gmail Rejecting Emails? Check Your Domain

This error means neither SPF nor DKIM passed with alignment. The domain in your From header must match the domain that passed SPF (Return-Path) or DKIM (d= tag). Check your DMARC alignment.

Your sending IP is not authorized in SPF, or DKIM signature is invalid. Verify your SPF includes all sending services and DKIM keys are correctly published. Check SPF | Check DKIM.

Your sending IP is on a blocklist. Google uses multiple reputation sources. Check your IP against major DNSBLs and request delisting. Check blacklist status.

Gmail is temporarily rejecting due to sending volume or reputation issues. Slow down sending rate and check Google Postmaster Tools for reputation data.

If your spam rate exceeds 0.3% in Google Postmaster Tools, Gmail will start rejecting emails. Clean your list, improve content, and add easy unsubscribe options.

Bulk senders must include List-Unsubscribe and List-Unsubscribe-Post headers for one-click unsubscribe. This is mandatory for marketing emails to Gmail.

Gmail rejects emails due to missing SPF/DKIM/DMARC authentication, blacklisted IPs, high spam complaint rates, or failing to meet Google's bulk sender requirements introduced in February 2024.

Senders of 5,000+ daily emails to Gmail must have SPF, DKIM, and DMARC (p=none minimum), one-click unsubscribe, spam rate under 0.3%, and valid PTR records for sending IPs.

Error 550 5.7.26 means DMARC authentication failed. Ensure SPF or DKIM passes AND aligns with your From domain. The domain in Return-Path or DKIM d= tag must match your From address domain.