← All tools
Email Header Analyzer
A message that landed in spam almost always says why in its headers - you just need to know where to look. Paste them and get SPF, DKIM and DMARC results, alignment problems, where the message was delayed, and whether the receiver flagged it.
Runs entirely in your browser - nothing you paste is uploaded. In Gmail: open the message, ⋮ menu, “Show original”, then copy the headers.
Headers show one message. Want to know how your whole sending setup looks to Gmail and Microsoft?
How we help: Consulting · Private infrastructure · Managed mailboxes · Monthly support