smtp for debian systems. Installation: apt install ssmtp Path: /etc/ssmtp/ssmtp.conf

ssmtp.conf

#
# Config file for sSMTP sendmail
#
# The person who gets all mail for userids < 1000
# Make this empty to disable rewriting.
root=gmailemail

# The place where the mail goes. The actual machine name is required no 
# MX records are consulted. Commonly mailhosts are named mail.domain.com
mailhub=smtp.gmail.com:587

AuthMethod=LOGIN
AuthUser=gmailemail
AuthPass=gmailpassword
UseTLS=YES
UseSTARTTLS=YES

# Where will the mail seem to come from?
rewriteDomain=gmail.com

# Where will the mail seem to come from?
#rewriteDomain=

# The full hostname
hostname=Magnus

# Are users allowed to set their own From: address?
# YES - Allow the user to specify their own From: address
# NO - Use the system generated From: address
FromLineOverride=YES

root:gmailemail:smtp.gmail.com:587