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===== Debugging Sendmail Problems =====
Here's a few tricks to help debug sendmail problems:
Finding the sendmail version:
sendmail -d0.1 -bt < /dev/null
Checking for valid MX records:
sendmail -bt > /mx in2nix.com
Should get back a list of MX records OR
nslookup -q=mx in2nix.com
You can check a target destination with:
sendmail -bt > /map host in2nix.com
Error messages are usually logged in the messages/syslog file, e.g. /var/adm/
messages on Solaris. However, this is dependent on the configuration of syslog
A common sendmail error is unknown host mailhost 550 . This can be caused by
sendmail not recognising the DNS domain. e.g. if the host is improperly defined
in /etc/hosts:
192.168.2.1 host1 host1.
instead of
192.168.2.1 host1 host1.in2nix.com
To check what sendmail thinks the domain is run:
sendmail -d0.1 -bt < /dev/null
**Still stuck? Maybe we can help.** Contact us [[https://www.upwork.com/o/profiles/users/_~01207a4bc438b48c6e|at Upwork]]
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