TES provides 3 different message sending services:
Sending messages to a single user or all followers: Sends one or more messages to a specific user or to all followers. Sending to a user is synchronous; sending to followers is asynchronous.
Sending messages to users in a list: Sends one or more messages to the users in the given list. Works asynchronously.
Sending different messages to users in a list: Sends individually defined message(s) to each user in the list. Works asynchronously.