Where are the logs?
The default location depends on your linux/unix system, but the most common places are
- /var/log/maillog
- /var/log/mail.log
- /var/adm/maillog
- /var/adm/syslog/mail.log
If it's not there, look up /etc/syslog.conf
. You should see something like this
mail.* -/var/log/maillog
sendmail writes logs to the mail
facility of syslog. Therefore, which file it gets written to depends on how syslog was configured.
If you system uses syslog-ng (instead of the more "traditional" syslog), then you'll have to look up your syslog-ng.conf
file. You'll should something like this:
# This files are the log come from the mail subsystem.
#
destination mail { file("/var/log/mail.log"); };
destination maillog { file("/var/log/maillog"); };
destination mailinfo { file("/var/log/mail.info"); };
destination mailwarn { file("/var/log/mail.warn"); };
destination mailerr { file("/var/log/mail.err"); };
Unable to send out emails?
One of the most common reason I've seen for a freshly installed sendmail not being able to send out emails is the DAEMON_OPTIONS being set to listen only on 127.0.0.1
See /etc/mail/sendmail.mc
dnl #
dnl # The following causes sendmail to only listen on the IPv4 loopback address
dnl # 127.0.0.1 and not on any other network devices. Remove the loopback
dnl # address restriction to accept email from the internet or intranet.
dnl #
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
If that's your case, remove the "Addr=127.0.0.1" part, rebuild your conf file and you're good to go!
DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
[root@server]$ m4 sendmail.mc > /etc/sendmail.cf
[root@server]$/etc/init.d/sendmail restart
If you've been making changes to /etc/sendmail.cf manually thus far (instead of the *.m4 file) you can make similar changes in /etc/sendmail.cf. The offending line will look like this:
O DaemonPortOptions=Port=smtp,Addr=127.0.0.1, Name=MTA
Change it to:
O DaemonPortOptions=Port=smtp, Name=MTA
I've figured out using the -f parameter. I started modifying sendmail.mc from scratch, I only included the MASQUERADE_AS properties.
Turns out it was a rejection by our network's firewall. I added an exception in the firewall. Sigh...
EDIT: I've resolved this using POSTFIX. Forget sendmail...
Best Answer
If you want to implement a catch-all address, do it like this:
Remember that the left hand side of the rules is separated by the right hand side with tabs. After updating your sendmail.mc with the above code run
sendmailconfig
However keep in mind that anything sent to the RCPT TO: command is checked via the check_rcpt rule set. To prevent username enumeration you may need to employ techniques like greylisting (I am using graymilter) and set proper values for greet_pause ClientConn and ClientRate.
A "catch all" address is not always a good solution. Think whether you want senders that typed the wrong address be informed of their mistake or not.