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Is there something I can run from the command line that will let me query postfix (running locally)?

  1. if an address is in the virtual address file and,
  2. where the mail for that address is routed to.

Ex: If I have the email address of [email protected]. I want to ask postfix if that virtual alias exists and then see that it's mail get routed to [email protected]

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2 Answers 2

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13

How about postalias:

 postalias -q [email protected] /path/to/your/valias_file
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    Note that you can have multiple alias files, defined in the postfix config file. For instance, we have a file that is generated by our ERP and a manual file of "special" addresses. The command does appear to take multiple files as arguments, but it finds the first instance of what you're searching for and stops. There are some odd cases where an alias shows up in both files. So the postalias command would need to be called once for each of those files, to be sure that you got everything.
    – Phil Erb
    Jan 23, 2012 at 18:12
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sendmail -bv [email protected]

Despite the name, this is a Postfix program. This will deliver an email to the caller's mail account that will give you the information about full address resolution. The command-line output is typically just:

Mail Delivery Status Report will be mailed to <yourusername>.

postalias -q will show you what the alias file has in it, as the previous responder said, but this may or may not be what actually happens; sendmail -bv is more complete.

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    I'm wondering why it's not more convenient for the program to also print the information we want on standard error.
    – Metamorphic
    Dec 29, 2021 at 9:09

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