Exchange 2010 on SBS Cannot Send

Have a new MPS cPanel server with ViaVerio.  Previously had a VPS3 Freebsd server.

Using Pop3 connector we just pointed our user to the domain, with email address and password.  Worked fine.

Now after moving to the new MPS host Pop3 connector fails to connect to the new email server.  Error is Authentication  failed error: 0x800ccc90 ("ixp_e_pop3_response_error") at d:\wssg_srv\sbs_sbs7\sbs\srs\messaging\pop3\
The credentials provided by for user account' 'xxxx' on the server are incorrect.

They are not incorrect.
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Let's clarify a few things.
Do you have a single catch-all mailbox in cPanel, or a mailbox for each user?
You're trying to set up the Microsoft Small Business POP3 Connector to retrieve emails from this/these account[s]?

In cPanel, under "Email Accounts", you should be able to select "More" --> "Configure email client" for the account in question:
cPanel configure email client This will take you to a page with all the account details you require:
cPanel email client settings
Compare this to the configuration page on the Windows SBS pop3 Connector, or post screenshots of both, and we can figure out where the differences are.
bbornerAuthor Commented:
The resolution to this issue was that during the switchover from one email host to another, exchange was hitting the new email host with requests for emails.   Some accounts were not yet set up on the MPS cPanel host.  So the MPS server blacklisted the exchange server's IP address with its Brute Force Security program.

Authentication was as a result declined on the sending side and on the receiving side.

We went in to Brute Force Security and whitelisted the IP of the exchange server and all is now well.

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bbornerAuthor Commented:
The resolution involved Microsoft Critical support and the technical staff from Verio web hosting
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