maddy/docs/internals/quirks.md

Implementation quirks

This page documents unusual behavior of the maddy protocols implementations. Some of these problems break standards, some don't but still can hurt interoperability.

SMTP

• for field is never included in the Received header field.

  This is allowed by RFC 2821.

IMAP

sql

• \Recent flag is not reset in all cases.

  This does not break RFC 3501. Clients relying on it will work (much) less efficiently.