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Email bounce messages vary in format and wording; some are geeky and difficult to understand, while others seem like a short story telling you that you probably mistyped an email address. Regardless, it’s important to read through the bounce message, looking for key phrases and error messages that describe the problem if you’re to have a chance of resolving the issue.

Common Error Messages

Mailbox Not Foundinvalid mailboxUser unknownnot our customer: these are all saying the same thing. If you’ve sent email to “” and get a bounce containing one of those complaints, the mail server “” doesn’t have an account for anyone with the email name “someone”. A couple of common reasons 분당스웨디시:

* You mistyped the email address. The single most common reason is simply that you made a typographical error in the email name. Check the entire email address for an error. Computers are very picky, and with the exception of upper/lower case email addresses must be exactly correct.

* It’s an old address that’s no longer in use. Perhaps the person you’re attempting to email has changed their email address and you’re using an old one which is no longer valid. Make sure what you’re using is current.

Mailbox unavailable: 9 times out of 10, this is exactly the same as “mailbox not found”. That other 10% of the time it could mean that there’s a problem with the recipients email account, though exactly what kind of problem is impossible to say. Check to make sure that you have the email address correct, wait a while and try again, and if it still bounces try contacting the recipient some other way.

Mailbox full, or Quote Exceeded: sometimes this will show up as a part of a “Mailbox unavailable” message. It’s fairly clear, though: your recipient has too much email and their server isn’t accepting any more. This is most common with web-based email services like Hotmail or Yahoo, which have limits on how much mail you can accumulate. This can also be a sign of an abandoned account – someone’s stopped looking at and cleaning out the email. In any case, you’ll need to try and contact your recipient through some other email account, or some other way.

Host unknownDomain Lookup Failed: this means that the mail server you’re attempting to use, the “” part doesn’t exist. A common reason is, once again, a typo on your part. Make sure you typed it in exactly correct. Another reason are ISPs that change their name and eventually stop supporting the old name. Even though there’s typically lots of warning, when the time comes anyone trying to send to an old email address might get this message in return when the switch is finally thrown.

Unable to Relay: this is a terribly obscure error message, but also becoming more and more common as ISPs try to crack down on spam. Mail is sent by relaying email from one server to the next. There could be many servers involved, but typically it’s the mail server at your ISP relaying your email to the mail server at your recipients ISP.

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