Posted 05 May 2010 - 12:50 PM
The problem is not in whether the sender's and recipient's domains are same or not, but because the program cannot resolve the domain you've substituted with "domain.com" (recipient domain). However it can resolve "externaldomain.com", that's why this works. This happens when you specify an unreachable domain and leave the SMTP default sending option "Detect automatically" (in the action properties). In this case the program tries to resolve the domain part of the recipient's email and get MX records for it (if there are no MX, it uses A or NS records). If your default DNS server cannot provide such information, the domain name resolves to invalid IP - 0.0.0.0, which you see as a result. Solution: make sure this domain is resolved by your DNS server correctly or add it to your "hosts" file. Another solution: change the SMTP sending option to "Use from Options" and specify the server's IP address in "File - Options - Email - SMTP server".
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