Linux : Quick Reference for Sendmail Issues
Just discussing some of the common sendmail issues and troubleshooting procedures in linux
Problem: Sendmail can not send mail to users in other domains.
Symptom:It can send mail to internal email account but can’t send mail to outside of the company or users in other domains.
Solution: To implement the solution, please execute the following steps:
1. Edit /etc/mail/sendmail.mc to have:
define(`SMART_HOST’,`<your full smtp server address>’)
and
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA’)dnl
Do NOT edit /etc/mail/sendmail.cf as it may cause unexpected results.
(The “DAEMON_OPTIONS” line is a security measure – it allows sendmail to accept e-mail only from the local server. If you do not need otherwise, this is a good security practice. )
2. Regenerate sendmail.cf from sendmail.mc:
# m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
3. Restart the sendmail service:
# service sendmail restart
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