In some examples, other characteristics of a message can be associated with a rule indicating that messages associated with such characteristics should be excluded from a message digest. For example, in some examples, if the first message or the second message is associated with an action item, the component of the server(s) 102 can refrain from generating a message digest and/or can refrain from adding that message to the message digest. In some examples, if the first message or the second message is associated with a high priority, the component of the server(s) 102 can refrain from generating a message digest and/or can refrain from adding that message to the message digest.