[Dovecot] mail_max_userip_connections=10

Hi,

A couple of questions rather than a problem for once!

We've got our Dovecot server running smoothly now apart from our MD. He's having problems with mail_max_userip_connections. He has 3 (Phone/Laptop/Tablet) items that all connect to the server at about the same time. Which means he's frequently running over the max_userip_connections.

My questions are:

Is there anyway of whitelisting an IP so that it can ignore mail_max_userip_connections=10?

What should we set mail_max_userip_connections too realistically? 10 seems a bit low?

Thanks

Tom