Sometimes we don’t get voicemail to email or update notifications from our asterisk pbx, in that case we can configure SMTP this way.

Modify your /etc/postfix/generic by adding these lines, replacing youremail@yourdomain.com with a real email account.

root youremail@yourdomain.com

root@localhost youremail@yourdomain.com

root@localhost.localdomain youremail@yourdomain.com

root@freepbx youremail@yourdomain.com

root@freepbx.localdomain youremail@yourdomain.com

asterisk youremail@yourdomain.com

asterisk@localhost youremail@yourdomain.com

asterisk@localhost.localdomain youremail@yourdomain.com

asterisk@freepbx youremail@yourdomain.com

asterisk@freepbx.localdomain youremail@yourdomain.com

vm@asterisk youremail@yourdomain.com

asterisk@ youremail@yourdomain.com

@freepbx.localdomain @yourdomain.com

Next Step is

Add the following to the end of /etc/postfix/main.cf

smtp_generic_maps = hash:/etc/postfix/generic

and

inet_protocols = ipv4

Reload postfix by running these commands:
postmap /etc/postfix/generic
service postfix restart

Additional Step for Office 365

v=spf1 ip4: **111.111.111.111** include:spf.protection.outlook.com ~all <– be sure to replace 111.111.111.111 with your public ip address