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What it means for senders

Standards

New RFCs and changes to DMARC, DKIM, SPF, BIMI, ARC and MTA-STS.

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News Standards

RFC 10080 Makes the Expires Header a Standard for Email

RFC 10080 lets any sender mark when an email stops being valid, and lets mailbox providers hide or de-emphasize expired mail. Here is what the new standard allows, what it forbids and how to use it.

  • Document: RFC 10080, Proposed Standard (IETF Standards Track), October 2026
  • Updates: RFC 4021, which had registered Expires as "not for general use"
  • Header: Expires: followed by an RFC 5322 date-time

Alaa · 3 Nov 2026 · 4 min read

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