Michael W. Cocke wrote: > Just FYI, AOL is doing reverse DNS and won't accept incoming email if > they don't approve of the sending IP address.. as in, they won't > accept messages from my domain because I use dyndns and not a static > IP.
It is probably not that you don't have reverse DNS. It is probably because you are using a dynamic IP address range. Your IP block is almost certainly listed in one of the DUL (Dial Up Lists) as a dynamic IP range and therefore you are getting blocked because of that and not because of not having reverse DNS registered. (Although you *should* have reverse DNS if you are an internet mail site.) Different reason but the same affect. Your ISP mail hub will be in a static block. You should use it as a smarthost. > I wonder how long that stupid idea will last? I also block IP blocks listed in DUL so don't try to send me mail either. IPs in dynamic ranges are anonymous. Spammers love them because there is no tracking of who is who there. That is one of my largest sources of spam. Yes, I could take the spam from the spammer and then use SA with a DUL list to tag it and toss it out after. But this would not send a bounce to the originator which would hide their configuration issues. And it is either a spammer or a misconfigured mail site and either way I don't need to handle it. I reject it at the earliest possible opportunity. I am not currently blocking 'unknown' sites but I have in the past. In one recent batch of non-spam (and some of those were questionable) mail 80 came from "unknown" hosts out of 2142 total non-spam messages. But I give big points to having "unknown" in the received header in SA as the rest of the posts are suggesting. In one recent batch of mail 1189 messages out of 3832 total spam messages came to my server from an unregistered IP address. So "unknown" sites account for nearly one third of my spam. Ratio of mail without reverse DNS: spam: 1189/3832 non-spam: 80/2142 Not having reverse DNS is a really strong spam sign. Bob
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