Just tested it out and it appears to be working for me still.
I would suggest re-setting up this setting in your camera system.

You can also try using @msg.telus.com instead and see if that works.

Great suggestion.  

I did a test from my outlook, sending a very basic email to omynumber]@msg.koodomobile.com and @msg.telus.com.  Both worked! 

I’ll reboot the security system and see.

This one bounced….  or is being retried.  Still looking into it.

Your message hasn't been delivered yet The message "Test" you sent to 4xxxx@msg.koodomobile.com on Tue, 26 Mar 2024 13:22:36 +0000 couldn't be delivered due to: Recipient server unavailable or busy. We'll let you know if we can't deliver it successfully.   Further Information 4.2.0 p7hsrtDPXYNJAp7htrwY0m mail accepted for delivery AUP#BL   © 2003 - 2019 Mimecast Services Limited.

Quick update.

If I sent an email to phonenumber]]@ msg.koodomobile.com  or msg.telus.com it arrives on my phone as expected…..

HOWEVER, when I send the exact email from the mail server attached to my security software, the message never arrives.  NOTE: I’m sending the test message from the web client of the mail server, NOT from the security software.

Also using the web client, I sent a test email to my other email address and it arrived fine.

Is it possible that msg.koodomobile.com is blocking my FROM address? 

FINAL UPDATE !

The good IT people at Koodo fixed the problem! 

It’s now 6:10pm and an entire days’ worth of security notifications just hit my phone, all at once.  I did not make any changes on my end.

THANK-YOU KOODO !