Adding Quotas to an Exim Configuration

This note is a supplement to the virtual domain mail setup. I assume that you are delivering to a Maildir, I have not tried this with other delivery formats.

In my configuration I have added a fixed, global quota for all virtual users. This involves two changes:

1. In the virtual_delivery transport I have added the quota definition

   virtual_delivery:
   driver = appendfile
   directory=${extract {homedir}{${lookup mysql{USER_QUERY}}}{$value}fail}/Maildir
   delivery_date_add
   envelope_to_add
   return_path_add
   user =  mail
   maildir_format
   maildir_use_size_file
   quota = 20M
   quota_warn_threshold = 75% 
   

   Exim will automatically create the control files that are needed also by Courier-IMAP.
2. In the retry section I have added a line to say what to do when an over-quota condition is detected.

   
   # Immediate bounce of over-quota messages
   *                       quota
   #Catchall rule for other errors
   *                       *           F,2h,15m; G,16h,1h,1.5; F,4d,6h
   

   The ordering of the lines is important.

If you want per domain or per user quotas you will have to replace quota = 20M by a suitable lookup e.g.

quota = ${lookup mysql{select quota from Domains where domain='$domain'}{$value}{10M}}