When creating a Personal Distribution List (PDL) the following error occurs: The list you are trying to save exceeds the maximum size limit for distribution lists allowed by your organization. Reduce the number of members and try to save again.

Personal Distribution lists have a default of approximately 100 – 130 members. To avoid exceeding the limit, take a look at the three potential workaround:

Create more than one PDL
On the server, create the Distribution Group in Active Directory for large lists
On the server, increase the PDL size limit using Exchange Management Shell:
Set-TransportConfig -MaxRecipientEnvelopeLimit unlimited