When setting your delivery method, an option you will have is to have the tickets Sent in the Mail. When that option is chosen, an box will appear to define the "Mailing Fee." Mailing fees will always paid out to the organization.
As a portal you highly want to encourage your organizations to be responsible for mailing their own tickets. Although our batch printing makes printing the mailing receipts and tickets quick, actually stuffing them into envelopes is a fairly labor intensive process and not worth the fee.
If you do choose to handle the mailing for an organization, you will just be responsible for invoicing them for the fee.