It appears that Anne P. Mitchell, Esq. via mailop <amitch...@isipp.com> said: >Receivers don't block email from new IPs by default; they block them when they >notice something amiss with the email (be it >improper authentication, spam complaints, or something else).
Actually, they do. I recently renumbered my network into a /24 that was allocated in the 1990s but had never been routed before. Yahoo blocked all my mail. Someone I know there told me that they automatically block any newly routed space on the assumption that it's hijacked, and they're usually right. Then he unblcked it, but if I hadn't happened to know him, it would have taken a while to do. It sounds like AT&T does the same thing. Similarly, even if an IP has been routed, if it suddenly starts sending a lot of mail, it'll be blocked because that usually means it's spam. There is a lot of folklore about how you "warm up" an IP sending enough mail to get an IP reputation but not enough to trigger the spam blocks. Yeah, it's awful, but as someone might have mentioned, spammers ruin everything. R's, John _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
