Setting Up A Secure SMTP Server On Rackspace
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If your site is hosted with Rackspace and you are having trouble using the SMTP server you may have to replace smtp.emailsrvr.com with secure.emailsrvr.com in the SMTP Host area along with using SMTP Port 465
For help creating your outbound mail accounts, check out the SMTP Help Center Article. It includes the default settings for some common providers.