Hi everyone,

I'm trying to find a solution for this bug who appears 2 months ago :

dovecot: imap(%USER%): Error: read() failed: Broken pipe (FETCH BINARY[2] for mailbox INBOX UID (%d)

Where %USER% is the unix user and %d the UID of the mailbox.

This error appears each time a user tries to download an attachment from one of his emails. Whether with RoundCube or Thunderbird via VPN or not. I thought that it was related to my firewall but no. Furthermore the problem isn't present when users are at the office. Upload speed from our ADSL connection is pretty slow about 1mpbs, I thought maybe it was related but it was working fine since 2 years. So I'm really short of ideas.

Anyone could help me please ?

Best regards, Carl

# 2.2.27 (c0f36b0): /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.16 (fed8554) # OS: Linux 4.9.0-7-amd64 x86_64 Debian 9.5 auth_mechanisms = plain login disable_plaintext_auth = no mail_location = maildir:~/Maildir namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = } passdb { driver = pam } plugin { sieve = file:~/sieve;active=~/.dovecot.sieve sieve_after = /etc/dovecot/sieve-after } protocols = imap imap service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap-login { inet_listener imap { port = 0 } inet_listener imaps { port = 993 ssl = yes } } ssl = required ssl_ca =