Visitor III

Question

FortiGate Email Notifications Not Received on Outlook.com Email Accounts but Received on Company Email

Forum|Forum|8 days ago
July 7, 2026
7 replies
72 views

Hi everyone,

We are facing an issue where FortiGate email notifications are not being received by Outlook.com email accounts (Outlook, Hotmail, Live).

Our SMTP configuration is working correctly because all email notifications, including SSL VPN OTP emails and other system notifications, are successfully delivered to our company email accounts.

However, when the recipient is an Outlook.com email address, the emails are never received, including the Junk/Spam folder.

Has anyone experienced this issue? Is there any known compatibility issue, Microsoft filtering policy, or SMTP configuration that could cause Outlook.com to reject or silently drop emails sent by the FortiGate?

Any guidance or troubleshooting suggestions would be greatly appreciated.

FortiGate Model: 1101E

FortiOS Version: v7.4.11 build2878 (Mature)

FortiGate

sjoshi

Staff

Hi @Khaleelthe555

You are using FGT email notification for what feature?

Is it for automation stitches or email based 2fa.

can you share alertmail debug

diag debug reset
diag debug enable

diag debug console

diag debug console timestamp enable

diag deb application alertmail -1

Once the issue is reproduced the debug can be disabled:

diagnose debug disable

Thanks, Salon

Khaleelthe555Author

Visitor III

Hi @sjoshi,

We are using FortiGate email notifications for both Automation Stitches and email based 2FA.

For Automation Stitches, I tested using a company email ID, an Outlook email address, and a Gmail address in the address group. Email notifications are received successfully on the company email and Gmail accounts, but not on the Outlook email account.

The same behavior is observed with VPN email based 2FA. When an Outlook email address is configured for a user, the OTP is not received. However, OTP emails are received successfully on both the company email and Gmail accounts.

From the logs general system events also i can see Two-factor authentication code sent.

below ss for the automation stitches for admin login failed. Here i recieved the email notification in my company email id but didnt recieved for outlook email.

Khaleelthe555Author

Visitor III

i can see its sending 208.91.114.151 i believe its fortinet IP address from there its not sending to outlook mail id.

sjoshi

Staff

can you do one change

remove the company domain and gmail ID and just keep outlook ID(non working) and share the same debug output.

this time on different console at same time try to collect the pcap

diag sniff packet any ‘host 208.91.114.151 ‘ 4 0 l

Thanks, Salon

Khaleelthe555Author

Visitor III

sjoshi

Staff

Hi @Khaleelthe555

from the logs it clearly shows as send mail success. that means from FGT it is able to sent the mail and there is no error.

Also the same config from FGT are working for 2 different domain that itself isolates issue on FGT

I would suggest to check with your email server team if it is blocking anywhere in the mail server and maybe fortinet domain is not trusted in the mail server

Thanks, Salon