[Dovecot] "Disconnected in APPEND" sometimes when with attachment

[Igor Bogomazov]

Hello!

When I send a message with an attachment bigger than some undefined
size, the folllowing error appears in logs: "Disconnected in APPEND"

How to increase the allowed size or anything?

# dovecot -n
# 1.0.15: /etc/dovecot/dovecot.conf
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: pop3 pop3s imap imaps
ssl_cert_file: /usr/local/etc/ssl/certs/highlink.ru.pem
ssl_key_file: /usr/local/etc/ssl/private/highlink.ru.key
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
mail_privileged_group: mail
mail_location: maildir:~/.maildir
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %08Xu%08Xv
auth default:
  mechanisms: plain login
  passdb:
    driver: passwd-file
    args: /etc/dovecot/dovecot.passwd
  userdb:
    driver: passwd-file
    args: /etc/dovecot/dovecot.passwd
  socket:
    type: listen
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: dovecot
      group: dovecot
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