Maximum size for Mail recipient names in a single mail message?
Versions: ND7; ND8; ND8.5

Limit:
For individual names and private groups which expand locally: 15KB
For public groups which expand on a server: 5MB

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Additional notes:

For individual names and private groups which expand locally, 15KB; for public groups which expand on a server, 5MB of recipient names (based on fully qualified names, for example, Les Kaplan @ Marketing).

This limit in various releases of Lotus Notes/Domino:

	For individual names and private groups which expand locally: 15KB (R5 to 6.5) For public groups which expand on a server: 2MB
	For individual names and private groups which expand locally: 15KB (ND7 to 8.5) For public groups which expand on a server: 5MB

Tired of limits?

CoexLinks: high fidelity rendering of email to non-Notes email systems, customized doclinks, etc.
Midas LSX: export Notes data including rich text to CSV, EPUB, HTML, MIME and more.

We don't stop at the Limits of Lotus Notes/Domino... we start there.