Have you contacted Roadrunner? Looks like it might be them (from Palm's site): Error 550 5.7.1 Relaying Denied What to do
This error may occur when your outgoing POP or IMAP (SMTP) server settings are set correctly, but your mobile service provider's mail server does not allow relaying of email to other SMTP servers. The error can be solved by contacting your mobile service provider's technical support and requesting assistance to set up your outgoing (SMTP) server. Your carrier should set up VersaMail to use their outgoing (SMTP) server.
Another site had this:
I configured Versamail with RoadRunner with no problems. Here are the settings:
incoming server: pop-server.hvc.rr.com (if you're in nyc substitute nyc for hvc...or whatever region you are in)
outgoing server: cwmx.com
SteveTaz
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