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tokcum
tokcum
New Member
March 4, 2024
Question

How to enable FortiMail ARC Sealing

  • March 4, 2024
  • 4 replies
  • 5368 views

Hi,

 

I would like to to enable ARC Sealing on a domain protected by FortiMail. I enabled ARC Sealing in the DKIM settings on the protected domain as advised by the the FortiMail Admin Guide. However, checking the mail header of a received mail, I do not see any ARC Sealing headers from FortiMail.

 

Our mail flow for incoming mails looks like this: Internet -> FortiMail -> Exchange Online.

 

I already tested different settings, such as ARC Sealing direction, DKIM signing on the Inbound Session profile, and disabled header removal. However, ARC Sealing was not done.

 

Any idea what I'm missing or what is exactly necessary to make FortiMail to "ARC seal" incoming mails before forwarding them to Microsoft?

 

Thank you.

    4 replies

    Stephen_G
    Staff & Editor
    Stephen_G
    Staff & Editor
    March 6, 2024

    Hello tokcum,


    Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.


    Thanks,

    Stephen_G - Fortinet Community Team
    Stephen_G
    Staff & Editor
    Stephen_G
    Staff & Editor
    March 8, 2024

    Hello tokcum,

     

    We are still looking for someone to help you.

    We will come back to you ASAP.


    Regards,

    Stephen_G - Fortinet Community Team
      nagarajs_FTNT
      Staff
      nagarajs_FTNT
      Staff
      March 12, 2024

      Hello tokcum,

       

      For now in FML ARC sealing option, in Incoming direction we only support header from or mail from which is a protected domain in FML

      Incoming: Incoming email that has header from or mail from as a protected domain in FML (ARC sealing must be enabled in this domain advance setting).
      For example, email from internal1.com to internal2.com and internal1.com has been configured with ARC sealing in domain advance setting.

      Outgoing: outgoing email that from an internal user to outbound user.

      All: FML will do ARC sealing for emails that matched incoming/outgoing mentioned as above.

       

      Regards,

      Nagaraj

        ffn_jan
        ffn_jan
        New Member
        April 29, 2024

        Hi Nagaraj

         

        We have the same issue as tokcum - we never see any ARC-Seal from FML (V7.2.4), regardless of the sender and receiver domain and incoming or outgoing direction...

         

        ARC-Sealing is configured as "All", DKIM is otherwise working as expected. What do we miss here?

         

        Best Regards

        jan

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