secure.emailsrvr.com is the Incoming server Hostname.
993 is the secure incoming port number.
secure.emailsrvr.com is the outgoing server Hostname.
465 is the secure outgoing port number.
SSL is the secure connection.
Rackspace email id and password be the required authentication.
Your Rackspace email account’s username is your username.
Rackspace email account’s password is your password.
Above given are the App.Rackspace.com Server Settings.
See Also this post:- https://www.datarecovo.com/apps-rackspace-webmail-login/