Far far away in European country, a user complained about his Outlook DL member list size error. He manages a Outlook Distribution List (NOT Active Directory/Exchange Group or DL) which has various different Internet addresses. He was receiving the following error:
This distribution list has reached the maximum size for your network e-mail server. No new members could be added.
I found the exact Microsoft Support Knowledge base article 238569, see below.
After reading the above MSKB, I guesses the user has lots of contacts with more information (email, phone, address, company name, etc.,). So this is limiting him to add all relevant contacts to the local Outlook DL. Outlook DL has a size limit.
As the KB suggested, I gave him the solution of creating many small DLs and add them to the "Mother" DL.
If the DL has all Exchange recipients, I could have created a group in Active Directory. But all of his DL Members are external email addresses which I don’t want to create AD contacts to add them into Exchange DL.
Another day in paradise. Another weird answer to the user. Hey don’t hate me, I didn’t develop Outlook.