Every few days, my mailbox seizes up. No mail come in to my imap clients. I'm getting these errors over and over with my mailbox:
Error: Mailbox INBOX: Deleting corrupted cache record uid=371208: UID 371208: Broken physical size in mailbox INBOX: read(/var/mail/mgrant) failed: Cached message size smaller than expected (17212 < 17222, box=INBOX, UID=371208) Error: Mailbox INBOX: UID=371208: read(/var/mail/mgrant) failed: Cached message size smaller than expected (17212 < 17222, box=INBOX, UID=371208) (FETCH BODY[]) Error: Mailbox INBOX: Deleting corrupted cache record uid=371203: UID 371203: Broken physical size in mailbox INBOX: read(/var/mail/mgrant) failed: Cached message size smaller than expected (3904 < 3914, box=INBOX, UID=371203) Error: Mailbox INBOX: UID=371203: read(/var/mail/mgrant) failed: Cached message size smaller than expected (3904 < 3914, box=INBOX, UID=371203) (FETCH BODY[]) My inbox is an mbox file. I'm running dovecot installed on Debian Bullseye, the dovecot packages are all: 1:2.3.13+dfsg1-1 I am running sendmail and using procmail for local delivery. I suspect, but am not certain, that this may be some locking issue between procmail and dovecot but I have never been able to prove that. The final procmail rule which appends messages to my mailbox looks like this, the trailing ':' causes procmail to use a lockfile: :0: /var/mail/mgrant The locking config lines in 10-mail.conf are commented, but I have also tried uncommenting them, did not help: #mbox_read_locks = fcntl #mbox_write_locks = fcntl dotlock Though sometimes it seems to fix itself after a few hours, the only way I have found to fix this quickly is to manually remove the cache files and restart dovecot: rm ~/mail/.imap/INBOX/* systemctl restart dovecot I am not even sure this is a locking issue. Something definitely gets corrupted though. I do have several IMAP clients hitting the same mailbox (phone, laptop, desktop). On the phone, I run K9 and also the gmail client which talks imap. Also using thunderbird, outlook, and w10 mail, though typically not all at the same time. You could definitely say I am stress testing this setup a bit! Any ideas on how to resolve this? Michael Grant
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