dovecot-ceph-plugin
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[imap append] crash if append is interrupted.
if append gets interrupted, imap process fails with panic: file mail-index-transaction-update.c: line 345 (mail_index_expunge_last_append): assertion failed: (seq == t->last_new_seq)
- in case of abort, the ostream was not correctly closed
- in case of abort, the index entry only need to be removed if already written to the index.