[Evolution] Maximum contacts in a list?

[Dianne Reuby <pramclub yahoo co uk>]

Is there a maximum number of contacts that can be included in a list?

I've created an address book for the volunteers that I organise, and
added them to a contact list. There are just over 50. When I try to send
a message to the list, it fails, but without a message to tell me what's
caused it.

I'm wondering if this is an anti-spam feature.

Thanks