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[rkennedy]

What is the output of which mail?

Is it /usr/bin/sendmail? If so, your commands look correct.

[jriker1]

/usr/bin/which: no mail in (/root/perl5/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)

[mcapra]

Try which sendmail

Also check manually if there is a sendmail binary located at /usr/sbin/sendmail. Your command definitions are trying to access the binary at that location.

[jriker1]

/usr/sbin/sendmail

[mcapra]

That command definition look fine. There might be additional considerations for the postfix configuration, but you've covered all the important bits I can think of.