Hi guys,
I often see mail being rejected by recipient servers because an IP in a
Received From header is blacklisted somewhere.
This strikes me as a rather bad practise, since it undermines the whole
idea of SMTP authentication.
Here's an example reject:
550 5.7.1 This system has been configured to reject your mail. An IP
address (xx.xx.xx.xx) found in the message's 'Received:' headers is
listed by the lookup site 'sbl-xbl.spamhaus.org.'.
xx.xx.xx.xx is the client's IP, a regular dynamic IP on a broadband
connection. Which shouldn't have any relevance.
To make matters worse, the offending recipient site does not accept mail
for abuse/postmaster or any of the usual aliases.
How do you engage hosts like these to resolve such issues?
Thanks
K
