Issue Sending e-mails via external mail server does not work

[LechnerIT]

Server operating system version

Debian 11.9

Plesk version and microupdate number

Plesk Obsidian 18.0.60 Update #1

I would like to use my e-mail which is with IONOS for sending messages in Plesk. It's only about the outbox. I do NOT want to manage any emails in Plesk.
These errors are listed in the mail logs:


These are my installed e-mail components:


My active services in relation to e-mail:


My SMTP settings:


If you need more data/info, please let me know.
Many thanks in advance for your help.

 

[Kaspar@Plesk]

You could try port 587 instead. If that doesn't work either maybe this will help: getting errors trying to send email using msmtp

 

[LechnerIT]

Port 587 didnt worked too

 

[nmdpa3]

Possibly this....

msmtp uses STARTLS by default

Allow msmtp to use TLS over port 465 by adding the following line to ~/.msmtprc: tls_starttls off

(or wherever that would be in Plesk)