Forum Discussion
New Distribution List Group won't receive emails from external address
I am having trouble getting a new Distribution List group to work properly. I have setup in the admin portal under groups the distribution group email/alias, etc, and have checked the option "Allow External Senders to Email this Group". I verified a couple of times this box is in fact checked.
Everything is saved and its been a couple hours since setup.
When I send an email from my internal address to the distribution list address, it works fine - the distribution list delivers to the distribution list members. However, if I send to the list email address from an external address, I get a bounce back error "553 sorry, no mailbox here by that name. ulc: , rcp: 0001. (#5.7.1)" and no message is delivered.
Does it take time for things to propagate through the DNS or AD or something? In AD control, the distribution list shows as active and running. It works fine as I said internally... it just won't work for external email addresses... which is a requirement for what I am trying to do with it.
Any thoughts or suggestions?
- What are you sending from address wise to the distro group? I've seen many times where people will use a system to test using their own address which is spoofing and it won't allow that through usually or something similar. Assuming you sent form a yahoo or gmail to test?
ChrisWebbTech Yes that is correct - I sent the test from a gmail account. I also had someone else try from a gmail account, same result... but if sent from an internal account, it works like a champ.
- Also how is your mail routing? Are you hybrid? If so you can't create a distro in 365 only and it work from external since your front end devices routing through onprem won't know about it, but internally it will work because it doesn't leave the 365 mail servers. Something like that could be why, how is your end to end routing for mail coming into your o365 exchange instance, mx go on prem through a device to onprem front end into 365 or anything like that?
ChrisWebbTech I have no idea... but I have 3 other distro lists setup in the same manner, and they work just fine. Literally all have the exact same settings. The other 3 receive mail from external addresses with no problem. It has been a year or so since I set those up, but I just don't recall it taking more than a few minutes to work once set. It has been the better part of a day at this point and still not working.
I am happy to check some settings if you have the patience to tell me how to determine how my mail is routed, but I am not an IT guy, just a small business guy with no IT support :).
- well, first thing I would check, those groups that work, are they on your on-prem Active directory server in the same OU as the one you just created? Assuming you have an on-prem AD server. That's the first place I would check / find out, cause if you do then your mail may be routing still on-prem somehow. If everything is 365 then not going to be the issue at all.
