Exim's Retry Configuration

I have already explained a little about the retry rules, the section begins with the heading "begin retry".

Retry Defination

Retry Rule

This single retry rule applies to all domains and all errors. It specifies retries every 15 minutes for 2 hours, then increasing retry intervals, starting at 1 hour and increasing each time by a factor of 1.5, up to 16 hours, then retries every 6 hours until 4 days have passed since the first failed delivery. Please note that these rules only limit the frequenzy of retries, the effective retry-time depends on the frequenzy of queue-running, too.

# Domain               Error       Retries
# ------               -----       -------

*                      *           F,2h,15m; G,16h,1h,1.5; F,4d,6h