Taken from Using MacOSX Lion command line mail with Gmail as SMTP
Edit file /etc/postfix/main.cf
sudo vim /etc/postfix/main.cf
and add in the following below the commented out relayhosts :-
myhostname = smtp.gmail.com
.
.
.
# SASL SUPPORT FOR SERVERS
#
# The following options set parameters needed by Postfix to enable
# Cyrus-SASL support for authentication of mail servers.
#
relayhost = [smtp.gmail.com]:587
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_use_tls = yes
sudo vim /etc/postfix/sasl_passwd
and enter in the following:-
[smtp.gmail.com]:587 username@gmail.com:password
sudo chmod 600 /etc/postfix/sasl_passwd
sudo postmap /etc/postfix/sasl_passwd
sudo launchctl stop org.postfix.master
sudo launchctl start org.postfix.master
test by sending the contents of a directory to an email address with the following:
tree /var/www/somefolder | mail -s "contents" your@yourdomain.com
If you receive the following error:
send-mail: fatal: chdir /Library/Server/Mail/Data/spool: No such file or directory
you can do the following:
sudo mkdir -p /Library/Server/Mail/Data/spool
sudo /usr/sbin/postfix set-permissions
sudo /usr/sbin/postfix start
as per this question.
NB: If things aint sending / receiving, and you're getting notices, check that the mail servers you're using are actually working!
NOTE: A crappy way to get around Google's
Someone just tried to sign in to your Google Account [youremail]@gmail.com from an app that doesn't meet modern security standards.
is to enable less secure apps on your account: https://www.google.com/settings/security/lesssecureapps. Do this at your own discretion.
i had issue that postfix is running,but when i send mail ,the username is the my mac username@smtp.gmail.com(i had in the sasl_passwd wrote the gmail username) ,then i got the ERROR 5.1.1,who can tell me how to deal with it