Also, I don't know if you need to enumerate all possible messages for bulk email tasks, but there are several possible, depending on various counts.  These messages are:

"Unable to find any recipients to be emailed"
"Message failed to be emailed for any of {attempted} recipients"
"Message successfully emailed for {attempted} recipients"
"Message emailed for {succeeded} of {attempted} recipients" 

Info about "skipping" is output if non-zero, and the "out of" total is output if the attempts is not (yet) equal to the total.

But just providing one example may be sufficient.