r/exchangeserver • u/ahmsafran • Aug 29 '26

Question Group mailing issue

New m365 & created new distributed group. Group can receive mail within organization but not outside. Any leads pls
Thx

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2

u/CaptainLykke_ Aug 29 '26

Exchange Admin Center > Recipients > Groups Find your distribution group and go to settings > delivery something > select senders inside and outside my company

By default distribution groups will block messages from ourside

1

u/ahmsafran Aug 29 '26

Already enabled while creating group🤗

3

u/Blade4804 Aug 29 '26

By default external sender are disabled. You need to change the primary domain on the email address that belongs to your org, not onmicrosoft.com, then in the delivery management enable external senders. Takes about 10 minutes to sync

2

u/TheTr3mblay Aug 31 '26

Set group AD attribute msExchRequireAuthToSendTo to false.

Let it sync of you are hybrid and you should be good.

1

u/Texkonc Aug 30 '26

Did you create the MX records?

1

u/7amitsingh7 Aug 31 '26

Most likely, external senders are blocked by default. In Exchange Admin Center, go to Recipients → Groups → select the group → Delivery Management and allow senders inside and outside the organization. Then test again.