I've upgraded the OpenSSL on my test mail server, and recompiled Stunnel. Now when Stunnel receives an email it gets stuck on the "SSL state (accept): before/accept initialization" step and times out after a few minutes. Log: 2013.12.24 10:42:58 LOG7[86137:140735299320160]: Service [ssmtp] accepted (FD=3) from 192.168.1.10:54839 2013.12.24 10:42:58 LOG7[86137:4392841216]: Service [ssmtp] started 2013.12.24 10:42:58 LOG7[86137:4392841216]: Waiting for a libwrap process 2013.12.24 10:42:58 LOG7[86137:4392841216]: Acquired libwrap process #1 2013.12.24 10:42:58 LOG7[86137:4392841216]: Releasing libwrap process #1 2013.12.24 10:42:58 LOG7[86137:4392841216]: Released libwrap process #1 2013.12.24 10:42:58 LOG7[86137:4392841216]: Service [ssmtp] permitted by libwrap from 192.168.1.10:54839 2013.12.24 10:42:58 LOG5[86137:4392841216]: Service [ssmtp] accepted connection from 192.168.1.10:54839 2013.12.24 10:42:58 LOG7[86137:4392841216]: SSL state (accept): before/accept initialization 2013.12.24 10:42:58 LOG7[86137:4392841216]: SNI: no virtual services defined 2013.12.24 10:42:58 LOG7[86137:4392841216]: SSL state (accept): SSLv3 read client hello A 2013.12.24 10:42:58 LOG7[86137:4392841216]: SSL state (accept): SSLv3 write server hello A 2013.12.24 10:42:58 LOG7[86137:4392841216]: SSL state (accept): SSLv3 write certificate A 2013.12.24 10:42:58 LOG7[86137:4392841216]: SSL state (accept): SSLv3 write key exchange A 2013.12.24 10:42:58 LOG7[86137:4392841216]: SSL state (accept): SSLv3 write server done A 2013.12.24 10:42:58 LOG7[86137:4392841216]: SSL state (accept): SSLv3 flush data 2013.12.24 10:42:58 LOG3[86137:4392841216]: SSL_accept: Peer suddenly disconnected 2013.12.24 10:42:58 LOG5[86137:4392841216]: Connection reset: 0 byte(s) sent to SSL, 0 byte(s) sent to socket 2013.12.24 10:42:58 LOG7[86137:4392841216]: Local socket (FD=3) closed 2013.12.24 10:42:58 LOG7[86137:4392841216]: Service [ssmtp] finished (0 left) 2013.12.24 10:42:58 LOG7[86137:140735299320160]: Service [ssmtp] accepted (FD=3) from 192.168.1.10:54840 2013.12.24 10:42:58 LOG7[86137:4392841216]: Service [ssmtp] started 2013.12.24 10:42:58 LOG7[86137:4392841216]: Waiting for a libwrap process 2013.12.24 10:42:58 LOG7[86137:4392841216]: Acquired libwrap process #1 2013.12.24 10:42:58 LOG7[86137:4392841216]: Releasing libwrap process #1 2013.12.24 10:42:58 LOG7[86137:4392841216]: Released libwrap process #1 2013.12.24 10:42:58 LOG7[86137:4392841216]: Service [ssmtp] permitted by libwrap from 192.168.1.10:54840 2013.12.24 10:42:58 LOG5[86137:4392841216]: Service [ssmtp] accepted connection from 192.168.1.10:54840 2013.12.24 10:42:58 LOG7[86137:4392841216]: SSL state (accept): before/accept initialization 2013.12.24 10:47:58 LOG6[86137:4392841216]: init_ssl: s_poll_wait: TIMEOUTbusy exceeded: sending reset 2013.12.24 10:47:58 LOG5[86137:4392841216]: Connection reset: 0 byte(s) sent to SSL, 0 byte(s) sent to socket 2013.12.24 10:47:58 LOG7[86137:4392841216]: Local socket (FD=3) closed 2013.12.24 10:47:58 LOG7[86137:4392841216]: Service [ssmtp] finished (0 left) Any suggestions? It was working fine before I upgraded OpenSSL to 1.00e. System is a Mac OS X 10.7.5 box. Thanks, James.