gubbe Posted September 14, 2006 Share Posted September 14, 2006 E-mail from: schaddo.de E-mail to: thusgaard.com IP-tracking: http://www.spamcop.net/bl.shtml?220.127.116.11 >554 5.0.0 Service unavailable ><<< 554 Error: no valid recipients *** 18.104.22.168 not listed in bl.spamcop.net *** I feel fairly helpless in this particular situation. It would seem that it's no problem to send e-mail from that domain to other e-mail address on the recipient's domain. Very odd. So what do I need to do? Who do I need to contact? The sender's ISP? The sender's SMTP or mail hosting provider? The receipient's mail hosting provider? Thanks in advance! Link to comment Share on other sites More sharing options...
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