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1.
Noun, U.K.
A story, scandal or occurrence that gives the English right-wing newspaper 'The Daily Mail' cause to print a report about the breakdown of society that has been caused by the event in question.
Mailbait: New statistics about immigration of Eastern European workers into the U.K. will likely lead to a headline in the Mail reading: "We're going to hell in a wheelbarrow and it's immigrants that are pushing it."
by kremlinjoe March 16, 2009
 
2.
Outgoing mail that is left in your curbside mailbox, so you can raise the pickup flag. This saves you have having to repeatedly run to the mailbox to see if the mailman has come.
"Just leave the utility bill here. I'll use it as mailbait because I'm expecting something important today."
by thaggas November 25, 2013