Email Checker | Hunter Email | Bounce Checker | Email Deliverability - MailTester

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How does e-mail work?
When an e-mail is sent, the following actions are taken:
First the destination mail server is determined by asking the DNS-server which server is responsible for the domain. The domain is the part after the @-sign in the e-mail address.
Next, an SMTP connection is made to that mail server (or, if it's not available, to the next mail server that is responsible for the domain). This is where the e-mail gets transferred to the recipient's mailbox.
Finally, the recipient will find the mail when checking the mailbox (e.g. using a POP3 or IMAP-client).

Is e-mail guaranteed to either be delivered or bounced?
No. There is no guarantee an e-mail is delivered, even if you didn't receive a bounce-mail.
There are several possible scenarios where you would not receive a bounce mail.
For example: when an SMTP server suddenly finds itself isolated from the Internet, it will not be able to send a bounce-mail.
Or maybe your address is not reachable so the bounce mail could not be delivered to you.

Is it possible that I can send e-mail, but not receive anything (or the other way around)?
Yes, sending and receiving are completely different things.
For sending you need to be able to contact the SMTP server.
For receiving you need to have access to your mailbox, usually via POP3 or IMAP. For mail to be able to arrive into your mailbox, your mailserver has to be registered in the DNS system, and it has to be reachable from the Internet.
Since sending and receiving are completely different actions, one can sometimes work while the other doesn't.

Where does MailTester.com come from?
A lot of people come to me asking if a certain e-mail address is having problems or why a certain e-mail address doesn't work. Usually the answer is in the bounce-mail, but often it is in such technical terms most people don't know what it means.
There are some routine tests I usually do to find out more about an e-mail address.
I decided to automate these tests, and make them available for everybody on this site.

How does MailTester.com work?
MailTester.com looks up the SMTP server responsible for the e-mail address, and tries to establish an SMTP connection. It then tries to send several commands, almost as if an e-mail is going to be sent. When enough information is gathered, the connection is aborted.