When verifying the header, check that next_uid is larger than last message's UID.
When verifying the header, check that next_uid is larger than last message's
UID.

Distrotech/dovecot,damoxc/dovecot,damoxc/dovecot,Distrotech/dovecot,damoxc/dovecot,Distrotech/dovecot,damoxc/dovecot,damoxc/dovecot,Distrotech/dovecot,Distrotech/dovecot