Loading ...Sendmail is only accepting connections from localhost (127.0.0.1 IP)
Q. My sendmail service is running under Linux and whenever I try to telnet it from other LAN IP, it gives connection refuse error. If I connect it from localhost it accept connection. I can only send mail from my server only. How do I force sendmail to accept mail from other hosts/LAN ips?
A. For security reason sendmail is by default configured to accept connection from local system (127.0.0.1). This should avoid open mail relay problem.
To allow connections from ALL hosts/LAN IPs open sendmail.mc file (login as the root):
# vi /etc/mail/sendmail.mc
Look for line that read as follows:
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
Comment or remove above line and insert new line that read as follows:
DAEMON_OPTIONS(`Port=smtp,Name=MTA')dnl
Above line will force to accept connection from any host. Save the file. Regenerate sendmail configuration file using m4:
# m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
Restart sendmail service :
# /etc/init.d/sendmail restart
Caution: You should configure firewall and other Sendmail Anti-Spam configuration control to avoid problems.
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Tags: addr, configuration file, configured, daemon, hosts, lan, Linux, local system, m4, mail relay, mta, open mail, running under linux, security reason, smtp
THanks!!! I was about to pull my hair out thinking it was my host. Such a simple fix.