[common] Notification message returned to sender by a site unable to
relay {email} to the intended Internet address recipient or the next
link in a {bang path} (see {bounce}, sense 1). Reasons might include
a nonexistent or misspelled username 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.
[glossary]
[Reference(s) to this entry by made by: {barfmail}{black hole}{bounce}{nastygram}{software laser}{sorcerer's apprentice mode}]