Cannot be delivered error

[BaranS]

Hello,
When I sent an e-mail yesterday to the address where I could send e-mails before, I received a reply from @fortimailcloud.com with the error "the following addresses had permament fatal errors".
I am sending a screenshot

[AEK · Accepted solution]

Hello Baran

You may have a problem a with mail deliverability, and it may be temporary or permanent.

Try test it with mail-tester.com and see what is wrong with it.

[BaranS]

Hello , thanks for answer.

Should we send the e-mail test from our address?

[AEK]

Absolutely

[BaranS]

Test looking good. 9/10

[AEK]

I think your mail deliverability is fine.

What you can do is to expand the "You're properly authenticated" and check if you EHLO/HELO message is the same as the rDNS of your SMTP gateway's IP and the same as your MX DNS record (I guess it is the same since the test passed/green).

If it is ok the it was probably a temporary problem.

[BaranS]

Sorry for being a newbie,
How can I do these checks?

[AEK]

On the same page (mail-tester result), expand the "You're properly authenticated" menu and check the information.