In addition to order verification practices, look at the WHOIS results for the domain name they're requesting RDNS for. If it was registered within the last week or so, or less, almost certainly going to be used for SPAM. Here are two instances caught by my RBL's just this morning.
Domain Name: CFBCF . MOBI
Created On: 08-Jan-2014 12:08:50 UTC
Last Updated On: 08-Jan-2014 15:15:22 UTC
Expiration Date: 08-Jan-2015 12:08:50 UTC
Sponsoring Registrar: eNom, Inc (48)
Domain Name: AFFRNS . MOBI
Created On: 08-Jan-2014 11:54:57 UTC
Last Updated On: 08-Jan-2014 13:09:26 UTC
Expiration Date: 08-Jan-2015 11:54:57 UTC
Sponsoring Registrar:eNom, Inc (48)
I just saw there is have some email marketing applications.
Just a hunch.... PowerMTA, right? If so, did the customer request CentOS 5x for their OS template?
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