I cant connect to external SMTP

Help! (Home for newbies)
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SYSTEM INFORMATION
OS type and version UBUNTU 20.4
Virtualmin version GPL LAST ONE

Hello Guys I hope you are doing well . I have issue with external SMTP I try via Gmass with mail.mysite.com:587 email user and pass and I got this error :

Screenshot 2024-01-03 045700

and in roundcube I send many emails test and is working fine . Can you please help me to fix this issue

Thanks a lot .

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