Hi all! We are pleased to release v0.5.21 of Pigeonhole. https://pigeonhole.dovecot.org/releases/2.3/dovecot-2.3-pigeonhole-0.5.21.ta... https://pigeonhole.dovecot.org/releases/2.3/dovecot-2.3-pigeonhole-0.5.21.ta... Binary packages in https://repo.dovecot.org/ Docker images in https://hub.docker.com/r/dovecot/dovecot Regards, Aki Tuomi Open-Xchange oy --- - sieve: Using the deleteheader action on a message with a broken/invalid header can cause the Sieve interpreter to crash with an assert panic. This can happen e.g. when the message is missing the empty EOH line between the headers and the body of the message. Fixes: Panic: file edit-mail.c: line 820 (edit_mail_headers_parse): assertion failed: (body_offset > 0). - sieve: Pigeonhole added an extra Message-ID header during mail forwarding when the existing one was invalid. Now it adds the Message-ID only if it is entirely missing. Existing Message-ID(s) are left unchanged.