The Messaging Module has been tweaked slightly to make it a little more efficient.
Previously, if you used the module to send a message to individuals associated with proposals (as opposed to reviewers), it sent one message per person per proposal. (For example, if you sent a message to the primary contact and all presenters, and someone was both in two proposals, that person would receive just two emails, not four.)
Ideally, in cases where someone was associated with more than one proposal (and therefore received more than one email), the message would include at least one merge field to identify which proposal the message was for. If that didn’t happen, an individual could receive multiple identical messages, which could be confusing.
To help avoid this issue, the module now checks to see if there are any merge fields in the message. If there are, it continues to send out one message per person per proposal. If no merge fields are present, it only sends out one message per person, regardless of how many proposals that person might have. So using the example above, that person would receive just one email, not two.