[Users] TLSv1.3 support

[Jerry]

claws-mail version 3.17.3 for Windows
Windows 10 Pro version 1903

Does claws-mail support 'TLSv1.3'? When sending mail, it only uses
'TLSv1.2'. I am using claws-mail to send mail to my MTA, 'postfix',
that does utilize 'TLSv1.3'.

Thanks

-- 
Jerry