Hello, I was curious if anyone had documentation or knew appropriate times to keep an SMTP connection open and when to close that connection. Would connecting via telnet to an ISP and watching when that connection closes, be the source of truth on how long an SMTP connection should be lasting with that particular ISP? Or would it be best just to hit up postmasters at various ISPs?
Doing some optimization to our mail server and this question came up. Wondering how best to find how long to keep an SMTP connection time open per recipient server. ISPs get angry if you just keep a connection open forever, but curious if there is an optimal time to close. Thanks for any help or tips. Ryan
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