bloop.email
IMAP settings

Rackspace Email IMAP and SMTP settings

The server settings to add an address on your own domain, hosted with Rackspace Email, to any mail app.

Incoming mail (IMAP)
Serversecure.emailsrvr.com
Port993
SecuritySSL/TLS
Outgoing mail (SMTP)
Serversecure.emailsrvr.com
Port465
SecuritySSL/TLS
Sign-in
UsernameYour full email address
PasswordYour Rackspace Email mailbox password.

From Rackspace Docs: Rackspace Email settings. Check there if something has changed.

Before you start

Use Rackspace Email in a native Mac app

Bloop.email works with any IMAP account. Enter these settings once, and Rackspace Email sits next to your other inboxes, with trackers blocked and nothing between your Mac and your provider.