Why is Sendmail not accepting connections from any host except localhost (127.0.0.1)?

Updated -

By default, Sendmail is configured to only accept connections from localhost (127.0.0.1). To allow connections from ALL hosts, please do the following:

Note: This will setup Sendmail to allow connections from ALL IP's and all interfaces on the machine.

  • Install the package with the following option

    
     # up2date se...

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