If your not using authenticated SMTP you shouldn't be allowed to send at all. The fact you could in the past and you're blocked by being on an RBL means your company email is probably setup very insecure.
You should contact your corporate Email admin to be sure the server is not setup as an open relay and that they only allowed authenticated SMTP connections. Otherwise they risk being exploited by spammers...
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Originally Posted by haus
Your corporate server is blocking your Sprint-assigned IP based on what appears to be a subscription to Barracuda's RBL service. You should use authentication for your corporate SMTP server, which should allow you to connect even from "untrusted" networks. Generally these days mail admins set it up so your POP/IMAP username and password are also used for the SMTP server, to keep things simple. Pocket Outlook offers a checkbox for "use same login settings as incoming mail server". Give it a shot, and check with your corporate IT folks for the correct SMTP settings.
One more edit: at least *in theory* using authenticated SMTP should allow you to connect from anywhere and bypass the RBL. If your corporate email administrator configured things properly...
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Well said