Issues with outlook?! Cannot send test message hello message 504.5.5.2

My YunoHost server

Hardware: AMD 64
YunoHost version: 4.2.8 (stable).
I have access to my server : Yes

Description of my issue

I never had any issues setting up a mail account using my Yuno server, but in outlook I get.
i’ve set everything according to Configuring email client | Yunohost Documentation
Ports and things, still get this error:

Any help please :wink: thanks!

Can you please translate the error message?
Searched error 504, found that it’s the smtp server name :

I know right that’s what I thought, that’s why I said never had any issue on any device except this time with lookout!

Meh i was to fast again, should have waited for the DNS records to do its thing…

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