On Wed, Dec 17, 2025, Matthias Apitz wrote: > $ openssl s_client -connect smtp.1blu.de:465
> AUTH LOGIN > 334 VXNlcm5hbWU6 > XXXXXXXXXXXXXXXXXXXX > 334 UGFzc3dvcmQ6 > XXXXXXXXXXXXXXXXXXXX > RENEGOTIATING Is there an 'R' in the XXX? AFAIR that triggers the "RENEGOTIATING" from s_client. Check whether there's some way to turn that off (it's not in the man page on my machine).
