troubleshooting Question

Our emails are going to SPAM for several recipients but we are not on any RBL's

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msidnamFlag for United States of America asked on
ExchangeAntiSpamEmail Servers
6 Comments1 Solution220 ViewsLast Modified:
I know the answer will be "have them add you to the whitelist", however this started to happen all at once today. For some reason about 6 or so clients told us that all our emails went right to their spam folder. We use a third party to send the emails (mimecast) and their IP's are not on any RBL's and they say its on the recipients side

One client is rejecting our emails but the error is vague.  Their IT guy is telling me that its not the IP being blocked but the content based on the "fingerprint" of the email. Yet he says the way to check the "fingerprint" isn't available to the public.

While researching the fingerprint, the only thing i came up with is something called Vipuls Razor that became a way to detect spam based on the email and not the domain, sender or IP. This is one snippet he sent me:

That fingerprint is for the IP address X.X.X.X, which sent messages that were reported spam by end users.

Looking at the feedback I see:
- 100% of reports seen were to block
- 0% of blocks were from spam traps
- First report : 2016-01-29 16:19:09
- Last report : 2016-02-29 19:26:19

The problem is, the IP they mention is not the one sending emails. It's the IP of my server, but I use mimecast as a smart host so my server IP never makes a connection and we have it locked down internally.

Another problem i have is that if i find out how to fix it i dont have a good way to test.

Has anyone come across this before? I feel like i'm in the middle of an email mafia.

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