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The error "Unroutable address / Unroutable mail domain" is a general error which can be caused by several things:

  1. a misspelled email address; for example, you have sent the mail to friend@coner.net instead of friend@corner.net; please check very carefully the spelling of the email address of your recipient and try sending the message again;

  2. you have exceeded the maximum number of e-mails allowed to be sent out per hour; in this case you should allow some time for the number of sent messages to be reduced and then resend the mail;

  3. the mail server cannot determine the correct route for sending your email message because of a DNS configuration error with the recipient's MX records; in this case the support for the remote server should be contacted for additional assistance

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