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Resolved Plesk on Debian 12 and SSL mail SMTP port 465 Problem

watis

New Pleskian
Server operating system version
Debian 12
Plesk version and microupdate number
18.0.57 #2
Hi, i cannot send mail from Thunderbird over 465 SSL. With 587 it works.
Settings:
 

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telnet watis.com.pl 465
Trying 127.0.1.1...
Connected to watis.com.pl.
Escape character is '^]'.

telnet watis.com.pl 587
Trying 127.0.1.1...
Connected to watis.com.pl.
Escape character is '^]'.
220 watis.com.pl ESMTP Postfix (Debian/GNU)
 
Why can't the default server certificate (for the server name) not be used to secure the mail server?
 
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