We have a distribution list (called "MasterDL", for example) that has sub-DLs inside it, as well as normal personal user email accounts alongside those nested DLs. For some reason, only the individual accounts are receiving any mail sent to MasterDL. Any members inside the sub-DLs do not receive anything sent to MasterDL in their inbox.

The server is Exchange 2010. The client being used is Outlook 2010.

How might this be occurring?

EDIT: It should be worth noting that the way the email is sent is through a VB/.NET SharePoint 2010 solution with the following relevant (pseudo)code:

System.Net.Mail.SmtpClient s;
System.Net.Mail.MailMessage m;
s.Port = 25;
s.Host = *our exchange server name*;
  • Do the nested DG's only accept email from Authenticated Users? – joeqwerty Oct 23 '13 at 20:30
  • There is a restriction on that group, not authenticated users, but a list of people and groups that can send to that group. Current there are two admin accounts that can send to that group, one of which we are using to send the email. – starmandeluxe Oct 23 '13 at 21:49

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