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apt update
apt install ssmtp mailutils

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vim /etc/ssmtp/ssmtp.conf

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

# 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=mail.hlmg.tech:465

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

AuthUser=notice@hlmg.tech
AuthPass=xxxxxxxxxxxxxxxxxxxxxxxx
UseTLS=YES
AuthMethod=LOGIN
# The full hostname
hostname=mail.hlmg.tech:465

# 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=NO

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vim /etc/ssmtp/revaliases

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# sSMTP aliases
# 
# Format:	local_account:outgoing_address:mailhub
#
# Example: root:your_login@your.domain:mailhub.your.domain[:port]
# where [:port] is an optional port number that defaults to 25.
root:notice@hlmg.tech:mail.hlmg.tech:465

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echo -e "Subject: Test Mail\nThis is the mail body" > /tmp/ssmtp-mail.txt
ssmtp admin@hlmg.tech < /tmp/ssmtp-mail.txt

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mail -s "Backup successfully" -a "From: Mailu Server Backup <notice@hlmg.tech>" wall@hlmg.tech < daily_backup.log