A method includes receiving a first request associated with a first user account and comprising content of a first message and a first plurality of destination endpoints, and a second request associated with a second user account and comprising content of a second message and a second plurality of destination endpoints to receive the second message, generating a first list of routing options for delivering the first message to the first plurality of destination endpoints, and a second list of routing options for delivering the second message to the second plurality of destination endpoints, generating, based on the first list of routing options, one or more versions of the first message for delivery to the first plurality of endpoints, and generating, based on the second list of routing options, one or more versions of the second message for delivery to the second plurality of endpoints. The method further includes causing the one or more versions of the first message to be transmitted to the first plurality of destination endpoints, and the one or more versions of the second message to be transmitted to the second plurality of destination endpoints, and providing first access rate statistics collected by tracking access to the one or more versions of the first message by the first plurality of destination endpoints, and second access rate statistics collected by tracking access to the one or more versions of the second message by the second plurality of destination endpoints.