Teaser only. This is not the full article. Complete guide with SPF, DKIM, and alignment fixes: Gmail Unverified Sender? Check DMARC
Recipients see "Be careful with this message" or an unverified sender banner. Your mail still delivers. Trust is already bleeding.
Gmail shows that warning when authentication is missing or DMARC does not align. SPF alone does not clear the banner if DKIM fails or your policy is monitor-only at p=none.
Verify the basics:
dig _dmarc.example.com TXT +short
dig example.com TXT +short | grep spf
You need a valid SPF path, DKIM signing on your From domain, and a DMARC record that matches how you actually send.
In the full post on zerohook.org:
- Exact Gmail banner triggers in 2026
- M365 and Google Workspace DKIM enable steps
- When p=none still shows warnings
- Moving from monitor to quarantine safely
Read the full guide: Gmail Unverified Sender? Check DMARC
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