Within the Supplier Configuration you can specify how suppliers want to receive emails/faxes. Separate callup for each schedule or to group them together.
Please be advised that attachments will only work if you choose Message Per Message.
The Message and Email group options are:-
MessagePerMessage (Default) - Each callup is sent out separately. This does not do any grouping
MessagePerContract - All messages for a contract go out at the same time
MessagePerDayPerPage (no longer supported - use Message per day)
MessagePerSupervisor - implies grouping by Business Unit of the contract also.
MessagePerBusinessUnit - Grouped based on contract's business unit
MessagePerDay - All call outs for a supplier for that day go in the same message. This is the maximum grouping possible