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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
Third Attempt           10 minutes after second attempt
Fourth Attempt         20 minutes after third attempt
Fifth Attempt            40 minutes after fourth attempt
Sixth Attempt           80 minutes after fifth attempt
Seventh Attempt      160 Minutes after sixth attempt
Eight Attempt           320 Minutes after seventh attempt
Ninth Attempt          640 Minutes after eight attempt

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