Fetchmail on new Devuan Beowulf fails where old version works.

My ancient debian host's fetchmail works fine with the ISP's
mailserver,  but fetchmail 6.4.0.beta4 on beowulf is ignoring the mail
server's capability  response, instead asking for STLS, which fails.

 erik@greipner:~$ fetchmail -cv
Enter password for [email protected]: 
erik@greipner:~$ more /tmp/fetchmail_log 
fetchmail: --check mode enabled, not fetching mail
fetchmail: 6.4.0.beta4 querying mailinternode.on.net (protocol POP3)
at Sat 27 Mar 2021 08:48:13 PM 
AEDT: poll started
fetchmail: Trying to connect to 203.16.214.182/110...connected.
fetchmail: POP3< +OK internode.on.net custmail47.internode.on.net
Ready
fetchmail: POP3> CAPA
fetchmail: POP3< +OK Capability list follows
fetchmail: POP3< TOP
fetchmail: POP3< UIDL
fetchmail: POP3< SURGEMAIL
fetchmail: POP3< USER
fetchmail: POP3< .
fetchmail: POP3> STLS
fetchmail: POP3< -ERR STLS not supported
fetchmail: STLS not supported
fetchmail: mail.internode.on.net: upgrade to TLS failed.
fetchmail: Unknown login or authentication error on
[email protected]
fetchmail: socket error while fetching from
[email protected]
fetchmail: 6.4.0.beta4 querying mail.internode.on.net (protocol POP3)
at Sat 27 Mar 2021 08:48:13 PM 
AEDT: poll completed
fetchmail: normal termination, status 2 
 Where "STLS" is interjected by the newfangled fetchmail above,
causing rejection, the ancient fetchmail amenably chooses "USER", and
everything is fine. 
 I thought the new problem might be due to the end of the last line in
the .fetchmailrc now produced by fetchmailconf: 
  # Configuration created Sat Mar 27 22:14:20 2021 by fetchmailconf
1.58
 set logfile "/tmp/fetchmail_log"
 set postmaster "erik"
 set bouncemail
 set no spambounce   
 set softbounce      
 set properties ""
 set daemon 600
 poll mail.internode.on.net with proto POP3 
        user 'dvalin' there is 'erik' here options fetchall
sslcertck 
 but deleting "sslcertck" made no difference. 

 Does anyone know what more can be done to make the new fetchmail
asgood as the old one? 
In about 30 years of fetchmail use, I've completely forgotten what it
is tohave an email fetch issue. This is quite novel.

Erik


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