I am a Comcast Business customer with one static IP address. My LAN is controlled by a Cisco RV325 VPN/VLAN appliance. What I want to do is implement a cron job on a Raspberry Pi that monitors a critical server elsewhere on my LAN and sends emails to maintainers in the outside world in the event of trouble. I have created and maintained Linux mail services on a small scale elsewhere (some postfix, some exim4) so I know the basics. I have never done it here on Comcast Business.
So, this is very straightforward. I just want, on RARE occasions, to send a VERY FEW emails outbound only to be handled by Comcast Business SMTP using my existing firstname.lastname@example.org account and password. I believe this technique is called SMTP Smarthost relay. I would like to know whether Comcast Business permits it, and if so, what do I need for configuration parameters for exim4 mail transfer agent on my Raspberry Pi.
I am aware there are posts in the Connectivity forum on this topic, but the ones I see are looking for remedies for something that wasn't working right. I am just looking for a straightforward yes/no, and if yes, then the exim4 configuration settings would be great.
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If you have an email on the Comcast mailserver then yes, however the FROM address MUST match the Comcast email address assigned.
You can send mails from email@example.com you can't send them from firstname.lastname@example.org
You must also use auth-smtp
I am not having success with sending from an on-premise device, even using the Primary Account holders Comcast business login as the sender and the authenicator using port 587 and auth-smtp. Any ideas?