Error 553: Unable to verify address

When you receive a message saying "unable to verify address", please make sure that you have enabled the SMTP authentication option in your email client. Also, note that you have to use the full e-mail address for username.

Example: you@yourdomain.com instead of you.

For more information on how to set up your email client, you can refer to our tutorial:

http://www.siteground.com/tutorials/email/

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