my email sometimes is rejected, do I have a problem with Sendmail config?
I hope someone can help...
It sometimes happens that my email gets rejected by certain ISPs. I get this message returned to me:
Diagnostic-Code: smtp; 550 5.7.1 Mail Refused - 212.150.48 - See http://security.<target ISP>.com/mail_blocks.htm#security - 20031204
What gives? Does anybody have a clue as to what's happening here? I believe that I started seeing this problem after a friend upgraded Sendmail for me, although I can't be sure that this is the case.
In any case, is this a Sendmail problem? A DNS problem? Any help would be GREATLY appreciated.
Thanks.
