A notification message returned to the sender by a site unable to relay e-mail
to the intended recipient or the next link in a bang path. Reasons might include
a nonexistent or misspelled user name or a down relay site. Bounce messages can
themselves fail, with occasionally ugly results; see sorcerer's apprentice mode
and software laser. The terms "bounce mail" and "barfmail" are also common.
bottom-up testing « botwar « bounce « bounce
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