Max BCC recipient count?

[batfastad]

Hi guys
Just looking to see how some of our users will cope when switching to Zimbra.
I'm looking for the best way to set up our customer marketing lists in Zimbra... 100-300 recipients.

What are any limits on the number of recipients that can be BCCd from the various interfaces that Zimbra supports?
AJAX / Thunderbird / Outlook

Is there a configurable server-side limit?

Would be especially handy if you could create an address list which subscribes to a remote .vcf (much like subscribing to a remote calendar)

Cheers, B