Here's the info
'Mail server host name in greeting'
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WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). If your mailserver sends out E-mail using this domain in its EHLO or HELO, your E-mail might get blocked by anti-spam software. This is also a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server. Note that this one test may use a cached DNS record.
mydomain.com claims to be host localhost.mydomain.com [but A lookup times out]:
220-localhost.mydomain.com ESMTP Exim 4.52 #1 Tue, 23 May 2006 05:27:01 -0500 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail.
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Here's 'Acceptance of postmaster address'
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WARNING: One or more of your mailservers does not accept mail to
abuse@mydomain.com. Mailservers are expected by RFC2142 to accept mail to abuse.
mydomain.com's abuse response:
>>> RCPT TO:<abuse@mydomain.com>
<<< 451 Temporary local problem - please try later
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Finally, here's 'Acceptance of postmaster address'
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WARNING: One or more of your mailservers may not accept mail to
postmaster@mydomain.com (it is generating a temporary error). Mailservers are required (RFC822 6.3, RFC1123 5.2.7, and RFC2821 4.5.1) to accept mail to postmaster.
mydomain.com's postmaster response: >>> RCPT TO:<postmaster@mydomain.com> <<< 451 Temporary local problem - please try later
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