Catchall for messages for nonexistent users

PROBLEM
I need a catchall on my Atmail Server + WebMail system for nonexistent users.

ENVIRONMENT

• On-Premise Server + WebMail Installations: Version 6.0 and 7.0

CAUSE
Should you want to have a catchall email address for emails addressed to users who do not exist, just do the following:

RESOLUTION

1. Open up /usr/local/atmail/mailserver/configure
2. Find this line
   

   mysql_user:
   driver = accept
   condition = ${lookup mysql {SELECT Account from UserSession WHERE Account='${local_part}@${domain}'} }
   retry_use_local_part
   transport=mysql_delivery

3. Add below it
   

   mysql_nonuser:
   driver = accept
   condition = !${lookup mysql {SELECT Account from UserSession WHERE Account='${local_part}@${domain}'} }
   # retry_use_local_part
   transport=mysql_nonuser_delivery

4. Then find the following
   

   mysql_autoreply:
   driver = autoreply
   headers = Content-Type: text/plain; charset=utf-8
   to = ${sender_address}
   from = ${sender_address}
   reply_to = "${local_part}@${domain}"
   subject = "AutoReply from ${local_part}@${domain}"
   text = ${lookup mysql {MYSQL_AUTOREPLY}{$value}}
   once = ${lookup mysql{SELECT concat(MailDir, "/autoreply.db") from Users where Account='${local_part}@${domain}'}}
   once_repeat = 1d
   once_file_size = 500K

5. Add below it
   

   mysql_nonuser_delivery:
   driver = appendfile
   maildir_format
   mode = 0660
   mode_fail_narrower = false
   envelope_to_add = true
   return_path_add = true
   directory = /usr/local/atmail/users/u/s/user@foo.com

   ⚠You must first create an account that will receive the archive logs. Replace user@foo.com with the user that will recieve the messages, and u/s the first 2 letter prefix of the account.
   
   
6. Restart Atmail Services
   

   /etc/init.d/atmailserver restart