Web Reference: When alias database search fails, and the recipient localpart contains the optional recipient delimiter (e.g., user+foo), the search is repeated for the unextended address (e.g., user). The propagate_unmatched_extensions parameter controls whether an unmatched address extension (+foo) is propagated to the result of table lookup. DevOps & SysAdmins: Postfix alias - catch-all not working as expectedHelpful? Please support me on Patreon: https://www.patreon.com/roelvandepaarWith thanks... This is called a catch-all alias. Those aliases catch all emails for a domain if there is no specific virtual user for that email address. Catchalls are considered a bad idea. It is tempting to generally forward all email addresses to one person if e.g. your marketing department requests a new email alias every week.
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