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Sending Test Challenge Causes Black Listing  -  KB Article #1337

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Some SMTP servers require authentication even when sending a message to your own address. When that is the case, Zaep may be unable to send a test challenge message. If after sending a test challenge message your email address appears in the black list, this is likely the reason.

To test Zaep when this occurs, we recommend that you use a free email account from or Click here (article 1321) to read more information about testing challenge messages.