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David_Franzen
David_Franzen
Explorer
June 16, 2023
Solved

FortiMail VM Email Loop when sending

  • June 16, 2023
  • 5 replies
  • 5448 views

Dear all,

 

I have a problem with a FortiMail  VM. I use my Fortimail as a gateway. Unfortunately, I have a loop when sending emails, which I cannot solve.

 

The following error scenario:

When I send an email from my M365 mailbox to another M365 mailbox this email goes into a loop and rejected with this error: "Remote server returned '554 5.4.6 < #5.4.6 SMTP; 554 5.4.6 Too many hops>'". When sending from my M365 to email addresses outside the Microsoft Cloud, the sending is successful.

Can you help me to solve this problem? I suspect the problem is because the 365 accounts are all accessible via the same IPv4 address?

 

Thank you very much for your help.

David

Best answer by srajeswaran

I think you are hitting this issue - https://learn.microsoft.com/en-us/exchange/troubleshoot/mailflow/hop-count-exceeded-possible-mail-loop

Can you apply the fix on the mail servers and check.

5 replies

Anthony_E
Staff
Anthony_E
Staff
June 19, 2023

Hello David,


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,

Best Regards
Anthony_E
Staff
Anthony_E
Staff
June 21, 2023

Hello David,

 

We are still looking for someone to help you.

We will come back to you ASAP.


Regards,

Best Regards
srajeswaran
Staff
srajeswaranAnswer
Staff
June 21, 2023

I think you are hitting this issue - https://learn.microsoft.com/en-us/exchange/troubleshoot/mailflow/hop-count-exceeded-possible-mail-loop

Can you apply the fix on the mail servers and check.

    David_Franzen
    David_FranzenAuthor
    Explorer
    June 21, 2023

    Hello, I was able to detect a misconfiguration of a rule. The problem has been solved.

    Thank you for your help.

      sahmed
      sahmed
      New Member
      August 9, 2023

      @David_Franzen , how did you resolve the issue? Can you please elaborate?

      MCORLOU
      MCORLOU
      New Member
      April 17, 2024

      Hello i'm facing the same problem with O365, there is a mail loop between our tenant and the recipient tenant.

       

      The design is like this :
      EXO ---> Fortimail ---> Web 
      when i send an email to a recipient in another tenant 365 it's seems to do this :

      EXO ----> Foritmail ----> EXO ----> fortimail ----> and again and again

       

      Notice that we don't have problem with all the others domains. Do you have any solution to fix this problem ? the solution mark as solved in this thread can be applied in our context.

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