Is there limitation of External contacts?

yes, it seems it's 1000 external contacts

Yes, there can be limitations when it comes to external contacts in various platforms, particularly in business communication tools, email systems, and CRM software. For example, in Microsoft Outlook or Teams, administrators can set restrictions on the number of external contacts or limit communication with them for security and compliance reasons. Similarly, email systems might have limits on the number of external contacts in a distribution list. These limitations help prevent spam, manage resources, and ensure data privacy. It’s important to review platform-specific settings and policies to understand any restrictions on external contacts.