SPAM is a real problem but it even worse worse when sending legitimate email and having some mail servers out there inadvertently flagging it as spam. Even worse than this is when a big company like McAfee is behind this activity. A company which, in my experience, provides horrible support and appears to operate without any clear processes;
I am talking about McAfee and their mxlogic.net spam filtering. This Saas based “cloud based” service filters your mail before your your email server to eliminate junk mail. sounds GREAT right, but if you are an end user and send an email to someone who uses one of your services, beware. Mx Logics mail servers could reject your message without giving you any logical explanation as to what went wrong.
If you are sending mail and your mail hits one these server, you will get a cryptic message with no clear indication as to what the problem may be. This then usually ends with a phone call to call his ISP. His ISP looks at the mail server logs and find a similar entry to below
2012-03-06 09:03:52 1S4g0R-0003ac-L5 ** email@example.com R=lookuphost T=remote_smtp: SMTP error from remote mail server after end of data: host maparchitecture.com.au.inbound10.mxlogicmx.net [126.96.36.199]: 554 Denied [CS] [848355f4.0.125264.00-2360.212489.p01c11m096.mxlogic.net] (Mode: normal)
The key is 554 Denied [CS]. The [CS] pertains to Content Source, and it means it does not like the words on your email body, so has rejected the message.
But of course, I am stating the obvious so I won’t go into the other acronyms.
In case you didnt know what [CS] means, they offer you to contact their world-class McAfee SaaS Email and Web Security customer support team on 1-877-695-6442, a 24/7, 365 days a year service. Once you get to speak to a support staff member, you are advised that you can only get support if you are a paying customer. So you need to be a paying customer in order to understand why your email was blocked by their systems. They offer no website that might explain what errors mean. This is obviously not a very well thought out process.
In the end, its the ISP’s who have to diagnose the problem and explain it to the end user providing free McAfee support while their CEO is serving detention in Guatemala and awaiting deportation to Belize. It would be nice, if all ISP’s could block mxlogic.net servers and reply with a cryptic message and offer no support.
Don’t take my word for it, google “mxlogic.net” and “how to remove listing” to find thousands of articles written by frustrated people just trying to get their user’s email delivered.