#1371 - Implement Require-Recipient-Valid-Since header

Identifier #1371
Issue type Feature request or suggestion
Title Implement Require-Recipient-Valid-Since header
Status Completed
Handling member Chris Graham
Addon core
Description Yahoo have started letting users buy old disused email addresses. This is a security risk, if accounts are associated with them.

However, Yahoo are using this new standard:
https://datatracker.ietf.org/doc/draft-ietf-appsawg-rrvs-header-field/?include_text=1

If a member is e-mailed from Composr, we could include the headers to say when the account was created. This allows services such as Yahoo to not let the email into the new recipients inbox.
Steps to reproduce

Funded? No
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Rating

Unrated