Mamasource's DNS Report - What Does It Mean?

I've received the same auto-generated reply from Mamasource for a week now. The names of the customer support person have changed, but the email is the same. I am not a technical person, but I was curious about the emails I've been receiving, so I did a little online investigation into the source. I really don't know what all this means, exactly, but I am hoping that some of you techies might know better, so please comment on my findings.

From what I can gather, the emails coming from the host IP are not configured the way they are supposed to be. In fact, configurations like this generally mean that the emails are from a spam source, not a valid and trusted source, but then again, as the results say, the results many have come from cached info, not current info.

Can someone decipher this for me?

DNS Report

Missing Reverse DNS record for MX records. It is required by RFC 1912 that you have reverse DNS (PTR) records for all of your mail servers. If you do not have reverse DNS entries, your email may not arrive some of the strict mail servers.

WARN Mail server host name in greeting 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.

FAIL Acceptance of postmaster address ERROR: One or more of your mailservers does not accept mail to postmaster@mamasource.com. Mailservers are required (RFC822 6.3, RFC1123 5.2.7, and RFC2821 4.5.1) to accept mail to postmaster.

WARN Acceptance of abuse address WARNING: One or more of your mailservers does not accept mail to abuse@mamasource.com. Mailservers are expected by RFC2142 to accept mail to abuse.