SMTP retrys on failure -- General Question about rfc.
We lost our network connection recently for about an hour and
I was going to explain to someone how mail servers work when
it came apparent that I did not know the exact retry rate that
other MTA servers use.
So, I have been looking for information on mail server (MTA) retries. There
does not seem to be any standard except 5 days seems to be the max. Am I
right here ?
Does anyone know if there is an RFC for mail servers regarding
mail retries ?
I found this but it does not explain the details:
What is the typical retry rate for most mail servers out there ?
I.E. MS Exchange,
I use the Postfix MTA, mine seems to say 'try to resend every 1000
seconds for 5 days':
postconf | grep -i queue
maximal_queue_lifetime = 5d
queue_run_delay = 1000s
Here is a [Random] Exim Config which specifies the MTA a retry rate
# begin retry
# Domain Error Retries
* * F,2h,15m; G,16h,2h,1.5; F,4d,8h
# 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 2 hours and increasing each time by a factor of 1.5, up to
# 16 hours, then retries every 8 hours until 4 days have passed since
# the first
Chester, MD 21619