I am a new bee, I have a plan in my office to implement Zimbra, The Structure of the plan is given below.

1. We already having the mail server hosted outside, currently we are making use of the same to send and receive the mails.

Now the Plan is, we are going to deploy the zimbra (FOSS) in different locations of our company, The Zimbra will be working as Local LAN Server so that it can successfully send and receive the mail via the mail server hosted outside.

I have a problem like, the hosted mail server party doesn't give us the option to relay.

I welcome if any one , gives me the solution in this respect..

Thanks in advance

If it is already asked in forum, I am unable to search it out,
so I welcome anyone to give me the feasible solution.