2009/3/24 Barney Desmond <barneydesm...@gmail.com>: > 2009/3/24 Ashwin Muni <ashwin.m...@gmail.com>: > Also i dont know why they defer our server mails >> >> Mar 24 12:44:47 suk1 postfix/smtp[10336]: 6B2F4CF5AD: host >> a.mx.mail.yahoo.com[67.195.168.31] said: 421 Message temporarily deferred - >> 4.16.51. Please refer to >> http://help.yahoo.com/help/us/mail/defer/defer-06.html (in reply to end of >> DATA command) > > As suggested, please read their explanation: > > START QUOTE > If you are seeing the error "421 Message temporarily deferred - > [numeric code]", where "[numeric code]" shows a specific diagnostic > code (e.g., "4.16.51", "4.16.52") in your SMTP logs, this indicates > that: > > 1. the message you attempted to send exhibited characteristics > indicative of spam,and/or > 2. emails from your network have been generating complaints from > Yahoo! Mail users. > END QUOTE > > That said, Yahoo (and Hotmail) are also known to permanently defer > mail from "unknown" high volume sending IPs. You should lookup their > guide on getting yourself whitelisted as a bulk sender if that's the > case.
I've also had problems with yahoo servers. If you're not a bulk sender (like me) then check http://www.postfix.org/faq.html#incoming for a nice little tweak. I still get occasional deferrals from yahoo servers, but they don't usually last more than an hour or so. They have truly atrocious anti spam measures and they don't provide any real way of contacting them. Filling out one of their forms at most leads to a form mail from an alleged human and then no replies from them after that. Guy -- Don't just do something...sit there!
