this post was submitted on 22 Jun 2024
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A tool on Linux to scan for inboxes on other mailservers? (slrpnk.net)
submitted 4 months ago* (last edited 4 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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[–] muntedcrocodile@lemm.ee 1 points 4 months ago (1 children)

I mean there is always the option to just send emails with an image link that auto loads and detect if someone loads it.

[–] boredsquirrel@slrpnk.net 2 points 4 months ago (1 children)

Interesting idea! But if servers block me after sending x mails to nonexistent inboxes, this doesnt help.

[–] muntedcrocodile@lemm.ee 3 points 4 months ago

Well now its simply a matter of how many email servers can u get emailing on your behalf. U can buy a list of 300 google accounts for about $3 (general email:pass lists are far cheaper but lower success rate) add a proxy network and a python script and u can bot em all. Use ai and url shortener to make ur email content harder to filter. Obviously this is hypothetical and i do not condone such activities.