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

LechnerIT

New Pleskian
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:
mail-log-error.png

These are my installed e-mail components:
installed-mail-components.png

My active services in relation to e-mail:
activated-services.png

My SMTP settings:
smtp-settings.png

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