Forum Discussion

Copper Contributor

Sep 23, 2019

Solved

External client SMTP Relay with group alias in From address field -- fails to send

Here is the situation: 1. Using an inventory system that handles our packing and shipping lists a. System emails copies of shipment records to clients using SMTP relay i. Syst...

Microsoft 365 Groups

office 365

NunoAriasSilva
Sep 23, 2019
Hi TheCoreSquirrel,

Based on your scenario the best option is to implement "Option 3" on the following article https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-office-3

For best security, please implement on your firewall that only your inventory system can contact Office 365 in port 25 or required servers.

Best regards,

Nuno Árias Silva

TheCoreSquirrel

Copper Contributor

Sep 27, 2019

I provided the information to our IT admin and between the two of us we were able to determine the best option for our org.

We decided on using the option 3 in the technical article link above for using a connector to the Outlook SMTP relay. The article states it is a more complicated option but it turned out to be pretty easy to implement. As long as you can work with SPF and MX record settings it's really no big deal.

Tested it and works like a charm so long as its from our domain. Thanks for the solution!

NunoAriasSilva
MVP
Sep 27, 2019
Hi TheCoreSquirrel,

I'm glad that the option 3 has worked to this scenario.

Best regards,

Nuno Árias Silva

My blog about Microsot Technologies: http://www.nuno-silva.net/Blog

Office 365 Essentials Book - https://www.nuno-silva.net/book-office-365-essentials