Forum Discussion

DrFMS's avatar
DrFMS
Copper Contributor
Apr 13, 2020

Open Specific External Domain for sending to blocked DLs

I'm looking for a solution to open an External domain to have the ability to send to Distribution Lists, which are blocked for External domains. I know we can do this, via a Transport Rule that targe...
Distribution list
office 365
Victor_Ivanidze's avatar
Victor_Ivanidze
Bronze Contributor
Apr 17, 2020

Hi DrFMS,

ok, understood.

 

Q1. do you have the DLs that should behave differently? In other words, can I assume that each your DL should reject external messages with exceptions?

Q2. if the list of external domains that can deliver to your DLs is the same for all DLs or different DLs have different lists of exceptions?

 

DrFMS's avatar
DrFMS
Copper Contributor
Apr 17, 2020

Hi, Victor_Ivanidze 

For the DLs, in question, they are blocked from receiving email from External domains.  The External domain that we want to allow is from a single tenant.  

  • Victor_Ivanidze's avatar
    Victor_Ivanidze
    Bronze Contributor
    Apr 18, 2020

    Hi again DrFMS,

     

    well I see 2 options then:

     

     1) (cheap & ugly)

       a. For each of 12000 DL you have to set a Custom attribute "attr1".

       b. Create a dynamic distribution list named allDLs whose members are DLs with custom attribute "attr1"

       c. Use allDLs in your transport rule

     

    2) (pretty elegant but pricey)

       create a customized Power Automate flow and run it in cooperation with a single transport rule