Issue Mails won't arrive

[jonny_alex]

Hey Guys

I currently wanted to use Outlook for my mails wich come to my domains.
All set up it seems like all works fine but my mails aren't arriving. There isn't any error or specific notification of failure.

I used SMTP without security certificates on the most recent Outlook version.

What are the most common problems with Outlook to recieve Mails?

Greetings