The username of someone who emailed me

Solution


If they wan to get back in touch with you, they will.
Then YOU do some investigation.

Find their website, phone number, detailed info.
If you pulled that from the From: line of an email, then it's pretty useless. Anyone can spoof the From: line with anything (i.e. I could send you an email that looks like it was sent from president@whitehouse.gov, or even your own email address). Unfortunately, email was designed back in a simpler time when people on the Internet trusted each other not to lie.

If you view the full headers of the email, there will be a series of "Received: from abc.def.com" lines. Those are a list of every server that was used to relay the email. They are generally accurate (they can be spoofed too, although many servers now add a signature to authenticate their receipt). If accurate, the bottom-most Received: line will be the server which first received the email. But it'll only tell you the email server, not who specifically sent it. Most email servers now require secure logins to access them, but not all of them do. And it's easy for a miscreant to use a non-secure server to generate a fake email, which is then relayed through secure servers to get to you.

This is more useful as a tool for figuring out which friend's computer was hit by a virus which sent copies of the virus to everyone in his address book. Those just use the infected person's email account but spoof the From: line. So you can track down which email server the message originated from, which usually narrows it down to a few friends who could've sent it to you.
 
So the email was sent to me by a company that wanted me to pay them to publish research papers, asking me to email them my full credit card information for them to publish it, I sent them an email asking about unexplained extra payment that they wanted, and then immediately I get an email with the @p3plsmtp22-05-25.prod.phx3.secureserver.net and now I'm worried
 


......prod.phx3.secureserver.net mostly links back to GoDaddy. Large hosting provider.

If you think this is merely spam, ignore it.
Have you actually sent your credit card info?
 


If they wan to get back in touch with you, they will.
Then YOU do some investigation.

Find their website, phone number, detailed info.
 
Solution

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