In TW 20230202 +, KDE3:kmail3 can no longer send via SMTP and SSL/TLS 
pop no longer works.  The TW version doesn't seem to matter. 

The cause is something in kdelibs3 3.5.10-241.19, possibly in combination
with kdepim3 3.5.10-290.18.   There is a workaround...

I used /var/cache/zypp with rpm --upgrade --force to revert to  
kdepim3-3.5.10-290.18.x86_64.rpm, which had no effect, but also 
reverting to  kdelibs3-3.5.10-241.16.x86_64.rpm got everything working
again.

The following was logged, seems to point to protocol issues, 
>> Feb 06 13:48:46  ksmserver[13902]: 40CF65DC027F0000:error:0A000102:SSL routines:ssl_choose_client_version:unsupported protocol:ssl/statem/statem_lib.c:1952:
>> Feb 06 13:48:49  ksmserver[13902]: 40CF65DC027F0000:error:0A000102:SSL routines:ssl_choose_client_version:unsupported protocol:ssl/statem/statem_lib.c:1952:
>> Feb 06 13:48:58  ksmserver[13923]: kioslave: ####### CRASH ###### protocol = smtps pid = 13923 signal = 11
>> Feb 06 13:49:00  ksmserver[13927]: kioslave: ####### CRASH ###### protocol = smtps pid = 13927 signal = 11
>> Feb 06 13:49:27  ksmserver[13902]: 40CF65DC027F0000:error:0A000102:SSL routines:ssl_choose_client_version:unsupported protocol:ssl/statem/statem_lib.c:1952:
>> Feb 06 13:49:37  ksmserver[13902]: 40CF65DC027F0000:error:0A000102:SSL routines:ssl_choose_client_version:unsupported protocol:ssl/statem/statem_lib.c:1952:
>> Feb 06 13:49:49  ksmserver[13946]: kioslave: ####### CRASH ###### protocol = smtps pid = 13946 signal = 11

Details of the SMTP server, no ports work, not even 25
Port with SSL: 465 or 587
Port with TLS: 587
Port without SSL/TLS: 25
Authentication method: Password
Requires sign-in    Yes

SSL and TLS pop on 995 stopped working, but unencrypted port 110 still works:
Port with SSL/TLS: 995
Port without SSL/TLS: 110
Username: Your username
Password: Your password
Authentication Type: Password