How To Use php mail() Function With Remote Smtp MailServer

Mail function in php, developers wants painless coding with email functionality .
we can still use remote smtp mail server with php mail function as below

# Install ssmtp
yum install ssmtp

# configure ssmtp

/etc/ssmtp/ssmtp.conf
root=noreply@testdomain.com
mailhub=myauthsmtp.com:2525
rewriteDomain=testdomain.com
hostname=myauthsmtp.com:2525
## ssl enabled with smtp then
UseSTARTTLS=YES
AuthUser=username
AuthPass=password
FromLineOverride=YES

# php.ini
replace
mailcmd=/usr/sbin/sendmail -t
with
mailcmd=ssmtp -t

# Another option stop/remove sendmail and replace it with ssmtp no need to change in php.ini

sudo service sendmail stop

sudo chkconfig --levels 2345 sendmail off

# links as below

sudo mv /usr/sbin/sendmail /usr/sbin/sendmail.orig

sudo ln -s /usr/bin/ssmtp/sbin/ssmtp /usr/sbin/sendmail

Note: system services will use default sendmail so always keep into account FROM addresses root@yourdomain.com must not be configured in order to avoid smtp account suspension .