Yes you will. But, before you leave google, I should point this out.
Do you have more than 50 users? Or do you just have more than 50 email addresses?
I only ask because, let's say you have 25 USERS of your email system. 10 mailing lists, and 20 vanity email addresses. That would put you over the "50" count, however with gmail the mailing lists and vanity email's do not count against the 50 user mark.
In the user control panel, you can create "Groups" or mailing lists, that doesn't count against your USER count, and lets say 1 user has 3 functions
etc etc etc
In John's user account, you can setup "Nicknames".
So if John loges in as 'jdoe' you can setup a nickname or an alias for the other email addresses that John would use. In the example above there are 3 email addresses, however it's only 1 user against your 50 user count.
And, inside gmail, you can arrange it so John can send email AS "Administrator (firstname.lastname@example.org)" or whatever.
I hope this helps.
Google is an amazing tool, and I'd hate to see someone shy away from it because they only limit you to 50 (free) user accounts..