12-05-2015
Which email software are you using on your AIX server? If it is something like "sendmail" then explore the Domain Masquerade function to ensure that the email appears to be sent from your company's external DNS-registered domain name. Further enhancements would be ensuring that the return path email address is a valid email address and that the Subject line is unique.
Spoofing server-generate email so that it will get past spam filters is an art which thankfully many of the spammers have not mastered.
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