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Privacy Concerns from Misspelling an Email Address?
(kbin.social)
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this post was submitted on 24 Jul 2023
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I'm curious to know whether the "wrong" domain has a DNS MX record, and where that goes. I expect it does, because if it didn't, you should have gotten an NDR.
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Lack of an MX record would normally cause the sending mail server to generate an NDR with something along the lines of "bad domain." If the sending server attempted to make an SMTP connected to the A record IP, and then there was no response there, I would expect that sending server to generate a similar NDR.
There are legitimate reasons not to send an NDR for undelivered mail. Invalid address (at a valid domain) would be one; this avoids backscatter and footprinting of valid addresses at a domain with brute force random recipients.
There appears to be one:
https://mxtoolbox.com/SuperTool.aspx?action=mx%3aptoton.me&run=toolpage
So one of several things happened when you sent that mail:
I wouldn't worry about it. I read elsewhere that you sent a blank email, so the only thing that would be "exposed," if that's even the right way to think about it, would be your email address.
However, based on your report of receiving a "message send failed" from Proton several hours later, I suspect the third is the real condition. There is an MX record; there is no mail server behind the IP for that MX record. When Proton tried to initiate an SMTP exchange at the MX IP, it got no response. Then the item went back into the queue to be retried later. Proton's timeout must be set to those "several hours" that elapsed between your clicking send and Proton giving up on trying to send. GMail's timeout may be different; you may yet get an NDR from that one, too.