>Is it possible to have sendmail only send email (not receive email)?
Yes. If you shutdown the sendmail daemon the system will still process e-mail out to the internet. Be aware that if you are having ISP/internet connectivity issues then your e-mail will queue as the daemon is no longer monitoring the queue. You will then have to force the e-mail out of the queue
>Is it possible to only sendmail email from 127.0.0.1?
By doing this you are indicating that messages are being written on the system itself, then yes it will work.
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