http://www.squirrelmail.org/

squirrelmail would not connect to bincimap, giving an error “Error connecting to IMAP server: tls://localhost. 115 : Operation now in progress” due to some openssl/php randomness.

in “/var/log/bincimaps/current”

[unknown@127.0.0.1:] error initializing Binc IMAP: SSL negotiation failed: Internal SSL error: error:1408F455:SSL routines:SSL3_GET_RECORD:decryption failed or bad record mac

who ever is doing the tls/ssl handshake has wonky fingers with wrong sides mac_nails, so edit the server method to be ssl rather than tls;

/usr/share/squirrelmail/functions/imap_general.php 
line 441 
- $imap_server_address = 'tls://' . $imap_server_address; 
+ $imap_server_address = 'ssl://' . $imap_server_address;