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submitted 8 months ago* (last edited 8 months ago) by boredsquirrel@slrpnk.net to c/linux@programming.dev

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I know this is basically a spam tool.

I think to know that you can query some info from a mailserver to test if an address exists.

I would like to find hidden addresses of some companies, for example I want to test if info@companyname.com exists.

Anyone know how to do that?

Update

I learned quite a bit

Mailserver block the requests that are used to get a list of inboxes ("accounts")
many servers will block mailservers that are not on an allowlist
many servers will block servers, if mails were sent to nonexistent addresses a couple of times
the message "recipient not known" will not appear often, as servers may "black hole" a senders mail and cut off the connection without sending the status message back

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[–] lemmyreader@lemmy.ml 2 points 8 months ago

I think to know that you can query some info from a mailserver to test if an address exists.

Yes, vrfy

For Postfix the default of disable_vrfy_command is : no So I assume you can try it risk free.