On Mon, 18 May 2015 17:39:11 +0100 Craig Skinner wrote: > RFC 5321, in section "4.5.4.1. Sending Strategy" has: > > .... > ... > .. > > Retries continue until the message is transmitted or the sender gives > up; the give-up time generally needs to be at least 4-5 days. ..... > > > > Are there any experiences, after how many hours/days the sender > > side (at the large ones like google, yahoo, hotmail, etc) > > gives up? > > > > I didn't make notes on that, sorry. > > From memory, they honour the 4 day rule.
I believe so with the possible exception of hotmail as I seem to remember thinking it was typical that microsoft were ignorant of the RFC's and stopped trying after hours.
