TLS failure with getmail-5.15

明道 何 <[email protected]> Wed, 10 Aug 2022 18:10:00 -0400 (EDT)
Newsgroups gmane.mail.getmail.user
Message-ID <[email protected]>
Could someone just give me a URI to read how to enable TLS for getmail-5.15?  

mingdao@shuttle ~ $ /usr/bin/getmail -rBruce-techfixrc -rHPC-Brucerc
Bruce-techfixrc: operation error (POP error (-ERR Your mailbox cannot be accessed. Please activate TLS in your mail program.))
HPC-Brucerc: operation error (POP error (-ERR Your mailbox cannot be accessed. Please activate TLS in your mail program.))
 
IONOS emailed that "unencrypted access and the use of the outdated TLS 1.0 and 1.1 encryption protocols to our email servers will no longer be possible on August 9, 2022".

I added under the [retriever] section:
ssl_version = tlsv1_2

The new output from /usr/bin/getmail -rmingdao-TechFixrc
Warning: ignoring unknown parameter "ssl_version" (value: tlsv1_2)
mingdao-TechFixrc: operation error (POP error (-ERR Your mailbox cannot be accessed. Please activate TLS in your mail program.))