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Re: RFC 2821 Address Resolution

2004-01-05 03:01:24

Valdis(_dot_)Kletnieks(_at_)vt(_dot_)edu writes:
Oh, and another not-yet-mentioned piece of wisdom from Motonori: When dealing with delivery of a message to multiple sites, having a truly asynchronous multi-threaded resolver is an incredible win (if the mail is going to 40 places, launching all 40 DNS queries at once means that you can start delivering mail as soon as you get the FIRST DNS reply packet back - even if you're doing MX piggybacking(*), you're still in the clear as long as any additional replies indicating piggybacking arrive in time for you to merge in their RCPT TO: (basically, as long as you haven't gotten to the DATA command).

You can improve that another bit if you a) delay the SMTP connection for a few tenths of a second from the time of the first DNS reply and b) base piggybacking on the IP address of each SMTP server rather than MX name. In my experience, at least.


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