Sending email on linux using SSMTP. [[http://www.nixtutor.com/linux/send-mail-with-gmail-and-ssmtp/]] [[http://wiki.debian.org/sSMTP]] [[http://www.terminally-incoherent.com/blog/2006/09/29/mutt-with-ssmtp/]] Edit ~/.muttrc for each user as appropriate (not that $HOSTNAME does not seem to be set with cron sending) set sendmail="/usr/sbin/ssmtp" #set from = $USER@$HOSTNAME #set from = username@HOSTNAME_OR_ALIAS.domain set realname="juckins@lightning" If you get an error like "Cannot open mailhub:25" you need to add the problematic user to the "mail" group. See information on setting permissions here: [[https://wiki.archlinux.org/index.php/SSMTP]] Update 26 January 2014: Gmail stopped sending, found information at [[http://serverfault.com/questions/560728/linux-ssmtp-error-cannot-open-smtp-gmail-com587]] Add this line to /etc/ssmtp/ssmtp.conf TLS_CA_File=/etc/pki/tls/certs/ca-bundle.crt Update 4 April 2015: Gmail stopped sending, couldn't connect to smtp server per /var/log/maillog errors. It suddenly started working again. Used "swaks" to troubleshoot per http://nekhbet.com/ssmtp_yahoo.shtml and saw this error: IO::Socket::INET6: connect: Network is unreachable Test was: $ swaks -tls -f john.fool007@yahoo.com -t ron.cool123@gmail.com -s smtp.mail.yahoo.com:587 -a LOGIN Seemed to be an IPv6 problem. Additional info for CentOS6: [[https://voidtech.wordpress.com/2014/03/11/configuring-send-emails-using-gmail-account-in-centos-6-with-ssmtp/]] ---- 4 November 2015 Gmail stopped working. This did not work: https://productforums.google.com/forum/?hl=en#!topic/gmail/2tK2fR7yW-k;context-place=forum/gmail Try a PHP or Perl solution, but does it require SSMTP or MSMTP? Final answer was to configure [[gmail_as_a_relay_on_linux|Gmail as a Relay]]