I'm trying to have a virtually hosted PHP site send emails to a particular Gmail address when the site's contact form is correctly filled out and submitted. Unfortunately, nothing is being sent out. In /var/log/mail.log I have numerous instances of things like this:
Jul 31 16:38:51 picus sm-mta[28576]: v6SL4xII018234: to=<[email protected]>,
delay=2+23:33:52, xdelay=00:00:00, mailer=esmtp, pri=38910659,
relay=mail.example.com., dsn=4.0.0, stat=Deferred:Connection refused by
mail.example.com.
I'm completely new to handling an email server, and simply wanted to use Sendmail since it's built into the distro I'm using and Swiftmailer supports it, so I'm not sure how to fix the problem.
My sendmail.mc file looks like:
divert(-1)dnl
#-----------------------------------------------------------------------------
# $Sendmail: debproto.mc,v 8.14.4 2014-10-02 17:54:06 cowboy Exp $
#
# Copyright (c) 1998-2010 Richard Nelson. All Rights Reserved.
#
# cf/debian/sendmail.mc. Generated from sendmail.mc.in by configure.
#
# sendmail.mc prototype config file for building Sendmail 8.14.4
#
# Note: the .in file supports 8.7.6 - 9.0.0, but the generated
# file is customized to the version noted above.
#
# This file is used to configure Sendmail for use with Debian systems.
#
# If you modify this file, you will have to regenerate /etc/mail/sendmail.cf
# by running this file through the m4 preprocessor via one of the following:
# * make (or make -C /etc/mail)
# * sendmailconfig
# * m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
# The first two options are preferred as they will also update other files
# that depend upon the contents of this file.
#
# The best documentation for this .mc file is:
# /usr/share/doc/sendmail-doc/cf.README.gz
#
#-----------------------------------------------------------------------------
divert(0)dnl
#
# Copyright (c) 1998-2005 Richard Nelson. All Rights Reserved.
#
# This file is used to configure Sendmail for use with Debian systems.
#
define(`_USE_ETC_MAIL_')dnl
include(`/usr/share/sendmail/cf/m4/cf.m4')dnl
VERSIONID(`$Id: sendmail.mc, v 8.14.4-8 2014-10-02 17:54:06 cowboy Exp $')
OSTYPE(`debian')dnl
DOMAIN(`debian-mta')dnl
dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
undefine(`confHOST_STATUS_DIRECTORY')dnl #DAEMON_HOSTSTATS=
dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
dnl #
dnl # General defines
dnl #
dnl # SAFE_FILE_ENV: [undefined] If set, sendmail will do a chroot()
dnl # into this directory before writing files.
dnl # If *all* your user accounts are under /home then use that
dnl # instead - it will prevent any writes outside of /home !
dnl # define(`confSAFE_FILE_ENV', `')dnl
dnl #
dnl # Daemon options - restrict to servicing LOCALHOST ONLY !!!
dnl # Remove `, Addr=' clauses to receive from any interface
dnl # If you want to support IPv6, switch the commented/uncommentd lines
dnl #
FEATURE(`no_default_msa')dnl
dnl DAEMON_OPTIONS(`Family=inet6, Name=MTA-v6, Port=smtp, Addr=::1')dnl
DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp, Addr=127.0.0.1')dnl
dnl DAEMON_OPTIONS(`Family=inet6, Name=MSP-v6, Port=submission, M=Ea, Addr=::1')dnl
DAEMON_OPTIONS(`Family=inet, Name=MSP-v4, Port=submission, M=Ea, Addr=127.0.0.1')dnl
dnl #
dnl # Be somewhat anal in what we allow
define(`confPRIVACY_FLAGS',dnl
`needmailhelo,needexpnhelo,needvrfyhelo,restrictqrun,restrictexpand,nobodyreturn,authwarnings')dnl
dnl #
dnl # Define connection throttling and window length
define(`confCONNECTION_RATE_THROTTLE', `15')dnl
define(`confCONNECTION_RATE_WINDOW_SIZE',`10m')dnl
dnl #
dnl # Features
dnl #
dnl # use /etc/mail/local-host-names
FEATURE(`use_cw_file')dnl
dnl #
dnl # The access db is the basis for most of sendmail's checking
FEATURE(`access_db', , `skip')dnl
dnl #
dnl # The greet_pause feature stops some automail bots - but check the
dnl # provided access db for details on excluding localhosts...
FEATURE(`greet_pause', `1000')dnl 1 seconds
dnl #
dnl # Delay_checks allows sender<->recipient checking
FEATURE(`delay_checks', `friend', `n')dnl
dnl #
dnl # If we get too many bad recipients, slow things down...
define(`confBAD_RCPT_THROTTLE',`3')dnl
dnl #
dnl # Stop connections that overflow our concurrent and time connection rates
FEATURE(`conncontrol', `nodelay', `terminate')dnl
FEATURE(`ratecontrol', `nodelay', `terminate')dnl
dnl #
dnl # If you're on a dialup link, you should enable this - so sendmail
dnl # will not bring up the link (it will queue mail for later)
dnl define(`confCON_EXPENSIVE',`True')dnl
dnl #
dnl # Dialup/LAN connection overrides
dnl #
include(`/etc/mail/m4/dialup.m4')dnl
include(`/etc/mail/m4/provider.m4')dnl
dnl #
dnl # Default Mailer setup
MAILER_DEFINITIONS
MAILER(`local')dnl
MAILER(`smtp')dnl
dnl # Masquerading options
FEATURE(`always_add_domain')dnl
MASQUERADE_AS(`debian')dnl
FEATURE(`allmasquerade')dnl
FEATURE(`masquerade_envelope')dnl
I think it may be a DNS issue, however, as I cannot connect to the server via telnet on port 25. The port seems to be open in my iptables:
$ sudo iptables -L -nv --line-numbers
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 0 0 DROP all -- * * 46.7.84.73 0.0.0.0/0
2 4047 304K fail2ban-ssh-ddos tcp -- * * 0.0.0.0/0 0.0.0.0/0 multiport dports 22
3 4926 376K fail2ban-recidive tcp -- * * 0.0.0.0/0 0.0.0.0/0
4 4048 304K fail2ban-ssh tcp -- * * 0.0.0.0/0 0.0.0.0/0 multiport dports 22
5 213 26142 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
6 0 0 REJECT all -- !lo * 127.0.0.0/8 0.0.0.0/0 reject-with icmp-port-unreachable
7 2 60 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW icmptype 8
8 26 1456 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 state NEW
9 14 816 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW
10 16 932 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:443 state NEW
11 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:587 state NEW
12 4 240 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:25 state NEW
13 4903 378K ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
14 114 7692 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 limit: avg 5/min burst 5 LOG flags 0 level 7 prefix "iptables_INPUT_denied: "
15 130 13980 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
num pkts bytes target prot opt in out source destination
1 0 0 DROP all -- * * 46.7.84.73 0.0.0.0/0
2 0 0 LOG all -- * * 0.0.0.0/0 0.0.0.0/0 limit: avg 5/min burst 5 LOG flags 0 level 7 prefix "iptables_FORWARD_denied: "
3 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
Chain OUTPUT (policy ACCEPT 129 packets, 11501 bytes)
num pkts bytes target prot opt in out source destination
1 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:587
2 105 15686 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:25
Chain fail2ban-recidive (1 references)
num pkts bytes target prot opt in out source destination
1 4926 376K RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
Chain fail2ban-ssh (1 references)
num pkts bytes target prot opt in out source destination
1 10 1276 REJECT all -- * * 91.197.232.103 0.0.0.0/0 reject-with icmp-port-unreachable
2 4038 303K RETURN all -- * * 0.0.0.0/0 0.0.0.0/0
The result of $ netstat -tan | grep LISTEN | grep 127.0.0.1 | sort is:
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
tcp6 0 0 :::443 :::* LISTEN
tcp6 0 0 :::80 :::* LISTEN
But the result of $ netstat -tan | grep 25 is
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
Is there a reason why it's not showing up in the first group?
/etc/mail/sendmail.mc? Can you modify it and recompile it into sendmail.cf? I can try to answer "general sendmail" question.