What is the frequency that the salesforce MTA re-delivers mail?
|Knowledge Article Number||000005299|
If for some reason the receiving mail server is un-reachable we will try to re-deliver the mail for the next 24 hours.
The retry intervals increase as time passes. These figures should be used as a guide as the intervals are based on the connectivity to the receiving MTA and the mail queue:
Second Attempt 5 minute after first attempt