The following update is available for Debian GNU/Linux 10 (Buster) Extended LTS to address a regression in the uw-imap toolkit package when using OpenSSL 1.1.1:
ELA-1134-1 uw-imap regression update
ELA-1134-1 uw-imap regression update
ELA-1134-1 uw-imap regression update
Package : uw-imap
Version : 8:2007f~dfsg-6+deb10u1 (buster)
The uw-imap toolkit package had a problem when used with openssl 1.1.1.
It could not work with Google IMAP servers because Google wants SNI requests if the client supports TLS 1.3.