We do not impose any limits on mailbox.However, any domains that store more than 5gb will not have email backed up to our backup cluster. These large mailboxes can be backed up for an extra fee:5gb - $5/mo10gb - $7.50/mo15gb - $10/mo20gb - $12.50/mo25gb - $15/moEmail backups more than 25gb are priced at $0.50/gb.
