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I got a 553 Error... Why?

From time to time an email that you send out will bounce back to you with the Error message 553 sorry, that domain isnít in my list of allowed rcpthosts (#5.7.1). What, in fact does that mean?

  1. The domain name or the email address (or one of the email addresses if sending to more than one destination) that you are trying to send to is either:
    • temporarily down
    • not available
    • misspelled
    • has not fully propagated yet (please note that full domain propagation can take between 24-72 hours). To verify when a domain was last updated, conduct a whois search on the domain.

      OR

  2. Your email client (ie. Thunderbird, Outlook Express, OSX Mail etc.) is not configured properly for sending email. It is attempting to send the email from your computer to the mail server (for onward transmission to its intended destination) without providing the right credentials, hence the server replies that you are not allowed to do so without proper authentication. Please do the following:
    • verify that "My outgoing server(SMTP) requires authentication" is selected, as explained here
    • ensure you are using your full email address as your username
    • if you have two or more domain names mapped together, e.g. mydomain.com and mydomain.co.uk, ensure you are using the primary domain name for your outgoing mail server name

Solution number 2 is normally relevant whether you are using Softflareís servers for your outgoing mail connection or your ISPís. Please check with your ISP if using their SMTP server to send email.


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