[SOLVED] Mail Server - Relay access denied - What on earth is this?
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only BAD configured smtp's do that. PBL blocking e.g. (spamhaus)
PBL is not a blacklist, although some lame ass mta administrators think so (because they block every IP in the PBL, thus lots of problems for their customers).
An MTA purely by itself would not know if the IP of the sender is Dynamic or static.
Secondly, infact each IP is dynamic in technical terms, since each netblock can be revoked, used as the LIR wants etc..
Can change as see fit...(thus dynamic)
This has nothing to do with bad configuration or admins.
There is no reason to run a mail server from a dynamic IP
It's refused by smtp servers, to reduce spam, same reason why most ISP's close port 25 on their dynamic ip pools
You are talking about ISP customers, not isp as in receiving party alone.
Right, well that has nothing to do with MTA's communications, but with the configurations done by the admins.
Indeed some isp's block outgoing smtp on the customers end directly, the customer can can only use the isp' mta to send the mail.
Some isp's however, allow you this: mta setup using a mail-gateway, so you still can host your own mta on the customers end, and use the isp mta as a transparent passthough/gateway.
I thought you were talking about mta's in general, and IP's in general.