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Email subject with question mark being blocked by Mimecast

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Posted on by Microsoft Employee

Hi there

Anybody else seeing this behaviour if you have mimecast on your company email infrastructure?

Scenario:

1. Send test email to myself from D4M, one with a question mark in the subject field, one without.

2. Receive email without question mark, don't receive the email that does contain one as it is blocked by Mimecast, our anti-spam solution.

3. Test sending of the exact same content from Dotmailer (the ESP that we are trying to move away from) and receive the email just fine.

Any help would be appreciated.

Thanks

Tim

Categories:
  • Community Member Profile Picture
    Community Member Microsoft Employee on at
    RE: Email subject with question mark being blocked by Mimecast

    Thanks Megan, if we had to customise our Mimecast to get deliverability up then we'd have to do that across all of our client base, so not really an option.

    I've been looking at general deliverability / spam scores and got this:

    spamassassin.png

    Onto the next level of investigation.

    Tim

  • Suggested answer
    megcda Profile Picture
    megcda 2,192 on at
    RE: Email subject with question mark being blocked by Mimecast

    Hi Tim,

    As Mimecast is easily customizable, I would suggest you reach out to your Admins to understand if this is being blocked due to their policy settings.  My suspicion is that this is the case given that other emails process without issue.  If it isn't being rejected due to Mimecast settings, then I would suggest opening a support ticket and the support team can work with you to help diagnose why you are seeing this issue.

    Thanks,

    Megan

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