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Contact ATT Customer Care Phone Number
AT&T error code 553 means that the outbound server has stopped working all of a sudden and the emails that you are sending from Microsoft Outlook 2016 cannot be sent. To ensure that you do not face this situation again, ensure to provide correct recipient details (email address), configure the IMAP and POP settings properly, refresh the default browser and resolve the internet troubles. You can also get in touch with Contact AT&T Customer Care Phone Number and talk to the techies about the same asking for an appropriate solution.
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