I've created a Thunderbird POP3 mail account to back up my IMAP messages.

Ok, at least you have a copy of all of those emails, but ideally, you need to put all the 'Dreamhost' emails into suitable folders in Local Folders account. Then you can remove/delete the pop and imap 'dreamhost' mail account.

Then create a new IMAP mail account to connect to Rackspace. Do not try to alter the existing IMap or pop mail accounts. File > New > Existing mail account or 3bar menu icon > New Messages > Existing mail account

the server names you mention do not sound correct. they are Rackspace DNS servers not your access via imap to your webserver.

Look at info here:

• http://www.rackspace.com/apps/support/portal/1088

Hi: Thank you for your helpful feedback. I resolved the mail exchange issue you pointed out after confirming changes I made to my DNS settings w/ the domain registrar.

I still have my POP3 mail account as backup and have not done anything with it yet.

I'm able to receive email but cannot send. I've changed my Outgoing SMTP settings to smtp.emailsrvr.com, (Rackspace email setting config), on Port 25, although they have 3 other alternatives and I've tried all but one of them.

I can't think of anything that's out of sequence with any of this. Any thoughts?

Many thanks, John

I would try port 587

Quote from Rackspace help Port Checker Tool

You can use the Port Checker Tool to test your ability to connect to our email servers. This allows you to identify any ports that are being blocked by firewalls or other restrictions at your location.

• http://www.rackspace.com/apps/support/portal/4266/941/943/1088/3810

re :I'm able to receive email but cannot send. do you get any pop up error message when you attempt to send? If yes, what error message ...word for word?