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ssmtpin my VMs, very lightweight. +1sendmailalone does not have the MTA - Mail Transport Agent to communicate outside the machine. By default, since Unixen are multi-user by design,sendmailwill send messages to other users in the same box but not outside.ssmtpis the MTA that I think is simplest to configure for gmail.UseSTARTTLS=Yesandmailhub=smtp.gmail.com:587andhostname=localhost. Took me hours to get it right :)