I got this message today (names have been changed to protect the innocent!). Is it saying i'm blacklisted, or the host i'm emailing to is blacklisted?
----------email-------------------
from localhost
----- The following addresses had permanent fatal errors ----- (email i'm mailing to) (expanded from: (their local alias name))
----- Transcript of session follows ----- ... while talking to mail-in.pol.net.uk.:(email i'm mailing to)
RCPT To:
<<< 550- <<< 550 mail from (my emailer ip address) rejected: administrative prohibition (host is blacklisted) 550 (email i'm mailing to)... User unknown
----------email-------------------
Sorry for the long quote, but I didn't want to lose the context. Are you on a dialup line? Do you have an upstream mailhub you should have used? A useful reference is spam.abuse.net . There are lists of ip addresses out there for known spam domains, open relays and dial-up lines. If you fall into the latter, you will only be able to send mail through your ISP's hub to a host that uses these lists. To fix, just reconfigure your mailer to use the mailhub as its "smarthost". For example, if we are both on dial-ups, our mail path would be:- me -> my isp -> your isp -> you John