1. A method comprising: receiving, at a server device from a sender, a first electronic message of a first communication-type addressed to a recipient; identifying, by the server device, a temporary reply telephone number from a pool of temporary reply telephone numbers, wherein the pool of temporary telephone numbers comprises a plurality of unassigned telephone numbers; associating the temporary reply telephone number with the sender of the first electronic message for the duration of a communication session between the sender and the recipient, the communication session comprising the first electronic message, a plurality of replies to the first electronic message, and one or more additional electronic messages of the first communication-type; preparing, using at least one processor of the server device, a second electronic message of a second communication-type comprising content of the first electronic message of the first communication-type; and sending, from the server device and via the temporary reply telephone number, the second electronic message of the second communication-type to the recipient.