1. A method comprising: receiving parameter information including delivery constraints associated with a mailer; associating the parameter information with a mailing; receiving statistical information, the statistical information including historical delivery guarantee performance data of at least two carriers; determining at least one routing sequence using at least one of the at least two carriers for the mailing based on the received mailer parameter information and the statistical information; outputting the at least one determined routing sequence for the mailing; and receiving parameter information associated with a recipient, wherein said determining is further based on the received recipient parameter information, the at least one routing sequence includes two routing sequences and outputting the at least one determined routing sequence includes outputting two routing sequences.