We are an organization using the Free plan as of now. Currently we are 3 users and we need to send emails to multiple media persons on a very frequent and regular basis. I want to know what is the limit on number of emails and on number of recipients per user that we can send each day. Also can one user send more if the other user is not using his/her full quota in a single day. 

Also is there any way to increase the number of sending emails per user and by how much it would be increased. 

P.S. I have heard about Zoho campaign but each email needs to be a bit different so I can't use Zoho Campaign here.