Most servers are configured this way, these days. When a catch-all is configured, the server never has a reason to respond with a 550, unless the address is not well-formed.Ģ) VRFY and EXPN: since RFC 2821 (circa 2001), these commands allow servers to respond with the non-committal response code 252. Some kind of catch-all sink that receives (and usually deletes) all the messages sent to non-existing addresses. Most of the email providers including, , are supported. Some servers just disregard this part of the specification, all the rest provide Email address verifier allows to check existence of an email account. While it should be possible in theory, in practice most SMTP servers out there do not comply too strictly with the SMTP protocol (mostly due to spamming).ġ) RCPT: according to RFC 2821, if you send the RCPT command followed by an address that the server can determine to be non-existing, you should get back a 550 response code.
Of course if you do that the address will always exist, because either the create failed because it already existed or it succeeded because it didn't yet so now it does exist.Īs reported above, what the OP asked for cannot be done in general. If it doesn't bounces it either exists or doesn't exist but the server for security reasons doesn't send delivery failure notifications (bounce messages).Īnother way can be to try and create a new account with the name, but for that you usually require special privileges that you most likely won't have (and server admins will seriously dislike you for creating all kinds of addresses just to see if you can). If the message bounces either the address does not exist or it doesn't want to talk with you. In general the only way to find out if an address exists (and it's not fully reliable) is to send a message to it and wait for a bounce. Thats according to a new study published in the Journal of Personality and Social Psychology. Why it matters: Casually and quickly checking in with the people in our lives is one of the easiest, but highest-impact actions we can take.
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If you could it would be a field day for spammers, they could just send that request to every mailserver in the world for every possible combination of characters and get a list of known-good addresses back. AOL phishing emails are on the rise again S/MIME provides encryption, which protects the content of e-mail messages, and digital signatures, which verify the identity of the sender of an e-mail message 11 Verify the Account Settings You can either delay the delivery of an individual email or you can also use rules to delay the Autoresponder in. 5 hours ago &0183 &32 We way underestimate how much the simplest text or call means to our friends, family members and colleagues.