Hello.
I have a problem sending e-mail to some domains (ex: yahoo.com). However I can send receive emails from everyone and I can send e-mail to some domains (ex: gmail).
The error message I get is "mta1287.mail.sk1.yahoo.com #554 5.7.1 This message has been blocked because the return email domain is invalid.(failed to obtain DNS record for domain <my external domain here>) ##"
My domain resolves just fine and the reverse dns also works.
My connectors are also ok.
I tried everything I could think of. I changed the smtp banner, changed the EHLO server name, talked to the ISP about DNS issues, but didn't resolve the issue.
Please give me have an idea.
Thanks in advance!
