Fixed sending slow problem on dovecot and exim and roundcube on directadmin

[golfreeze]

=== Fixed sending slow problem on dovecot and exim on directadmin
issue: delay around 20second when sending email via webmail roundcube

===== /etc/dovecot/conf/lmtp.conf
# LMTP socket for local delivery from exim
service lmtp {
  executable = lmtp -L
  process_min_avail = 32
  unix_listener lmtp-client {
    user = mail
    group = mail
    mode = 0660
  }
}


===== /etc/dovecot/dovecot.conf
service imap-login {
  process_min_avail = 32
  user = dovecot
}
service pop3-login {
  process_min_avail = 32
  user = dovecot
}

==Increase process_min_avail from 16 -> 32 on both configure file then restart service
systemctl restart dovecot
test send email and use 1 sec for sending process
: )