Courier IMAP 4.2.0 breaks SSL-Authd on 993

Updating to Courier IMAP 4.2.0_1 broke authentication with SSL on 993 for roundcube (and perhaps others) but not for Thunderbird. The following worked for me:

Change:

TLS_PROTOCOL=SSL3

to:

TLS_PROTOCOL=SSL23

in /usr/local/etc/courier-imap/imapd-ssl

(from this fine site)