pop3 stunnel to gmail

Joseph Brenner doomvox at gmail.com
Thu Sep 23 19:18:46 UTC 2010


I'm an mh user running ubuntu jaunty, and I want to get my local
email working over SSL connections to a gmail account (POP3/SMTP).
So I'm trying to get mh (probably nmh, but gnu mailutils would be
okay) to talk over SSL using stunnel.

I've succeeded in using slypheed to get mail from gmail, so I know the
gmail account is working and is set-up for pop3 and so on.  When I
run inc, though, it just reports:
    inc: no servers available

I can see that I've got stunnel running by doing a:
  ps ax | egrep stun | egrep -v egrep

Hm... but now that's reporting 6 stunnel processes, which doesn't seem right:
   5937 ?        SN     0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf
   5938 ?        SN     0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf
   5939 ?        SN     0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf
   5940 ?        SN     0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf
   5941 ?        SN     0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf
   5942 ?        SNs    0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf

I'm looking for suggestions on what I might be doing wrong, and
hints on how to go about isolating the problems.

Here's a summary of the kind of configurations I've been trying:

/etc/default/stunnel4:

  ENABLED=1
  FILES="/etc/stunnel/*.conf"
  OPTIONS=""
  PPP_RESTART=0

/etc/stunnel/stunnel.conf:

   sslVersion = SSLv3
   chroot = /var/lib/stunnel4/
   setuid = stunnel4
   setgid = stunnel4
   pid = /stunnel4.pid
   socket = l:TCP_NODELAY=1
   socket = r:TCP_NODELAY=1

   debug = 7
   output = /var/log/stunnel4/stunnel.log

   client = yes

   [pop3s]
   accept = 127.0.0.1:995
   connect = pop.gmail.com:110

   [smtps]
   accept = 127.0.0.1:465
   connect = smtp.gmail.com:25


/etc/nmh/mts.conf:

   mts: smtp
   hostable: /etc/nmh/hosts

   localname: smtp.gmail.com
   # localname: gmail.com

   masquerade:

   mmdfldir: /var/mail

   mmdflfil:

   # pophost: localhost
   # pophost: pop.gmail.com:995
   pophost: pop.gmail.com:110
   # pophost: pop.gmail.com

   # servers: localhost
   servers: smtp.gmail.com



/var/log/stunnel4/stunnel.log

2010.09.21 11:11:41 LOG7[6528:140533218399984]: Snagged 64 random
bytes from /dev/urandom
2010.09.21 11:11:41 LOG7[6528:140533218399984]: RAND_status claims
sufficient entropy for the PRNG
2010.09.21 11:11:41 LOG7[6528:140533218399984]: PRNG seeded successfully
2010.09.21 11:11:41 LOG7[6528:140533218399984]: SSL context
initialized for service pop3s
2010.09.21 11:11:41 LOG7[6528:140533218399984]: SSL context
initialized for service imaps
2010.09.21 11:11:41 LOG7[6528:140533218399984]: SSL context
initialized for service smtps
2010.09.21 11:11:41 LOG5[6528:140533218399984]: stunnel 4.22 on
x86_64-pc-linux-gnu with OpenSSL 0.9.8g 19 Oct 2007
2010.09.21 11:11:41 LOG5[6528:140533218399984]: Threading:PTHREAD
SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP
2010.09.21 11:11:41 LOG6[6528:140533218399984]: file ulimit = 1024
(can be changed with 'ulimit -n')
2010.09.21 11:11:41 LOG6[6528:140533218399984]: poll() used - no
FD_SETSIZE limit for file descriptors
2010.09.21 11:11:41 LOG5[6528:140533218399984]: 500 clients allowed
2010.09.21 11:11:41 LOG7[6528:140533218399984]: FD 10 in non-blocking mode
2010.09.21 11:11:41 LOG7[6528:140533218399984]: FD 11 in non-blocking mode
2010.09.21 11:11:41 LOG7[6528:140533218399984]: FD 12 in non-blocking mode
2010.09.21 11:11:41 LOG7[6528:140533218399984]: SO_REUSEADDR option
set on accept socket
2010.09.21 11:11:41 LOG7[6528:140533218399984]: pop3s bound to 127.0.0.1:1109
2010.09.21 11:11:41 LOG7[6528:140533218399984]: FD 13 in non-blocking mode
2010.09.21 11:11:41 LOG7[6528:140533218399984]: SO_REUSEADDR option
set on accept socket
2010.09.21 11:11:41 LOG7[6528:140533218399984]: imaps bound to 0.0.0.0:993
2010.09.21 11:11:41 LOG7[6528:140533218399984]: FD 14 in non-blocking mode
2010.09.21 11:11:41 LOG7[6528:140533218399984]: SO_REUSEADDR option
set on accept socket
2010.09.21 11:11:41 LOG7[6528:140533218399984]: smtps bound to 127.0.0.1:259
2010.09.21 11:11:41 LOG7[6534:140533218399984]: Created pid file /stunnel4.pid

/var/log/mail.log

Sep 21 13:40:32 fineline gnu-pop3d[15484]: Incoming connection opened
Sep 21 13:40:32 fineline gnu-pop3d[15484]: connect from 127.0.0.1
Sep 21 13:40:32 fineline gnu-pop3d[15484]: User `doomvox at gmail.com': nonexistent
Sep 21 13:40:32 fineline gnu-pop3d[15484]: Session ended for no user




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