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A tool on Linux to scan for inboxes on other mailservers? (slrpnk.net)

submitted 5 months ago* (last edited 5 months ago) by [email protected] to c/linux

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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 [email protected] 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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[–] [email protected] 2 points 5 months ago

This hasn't been possible for a long time. Mail servers do not typically reject a bad recipient immediately on the SMTP connection, they accept it and send a bounce email afterwards instead.