Trouble sending email to .mil and .gov clients.

TCI Administrator 1 Reputation point

We have several clients behind the .gov and .mil firewalls. Some of my users have no problem sending and receiving, but a couple, in particular, can not consistently send messages. I've used a third party service to evaluate our DKIM, SPF, etc settings and still have problems. Any knowledge out there that could shed light on this most frustrating problem?


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  1. Shaofan Lv-MSFT 4,710 Reputation points Microsoft Vendor

    Hello TCI,

    Yes, you can try encryption. .gov and .mil domain names may have additional security requirements or restrictions that may cause your email to be blocked or delayed. Blocked by a spam filter or the email was flagged as suspicious due to the content or attachments in the email.

    It is recommended that you contact the IT departments of these organizations. They may be able to provide you with more information about their email policy and any specific requirements for incoming email.



    thank you for your time and patience throughout this issue.

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