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Have you experienced issues with the SMTP functionality of POP and/or IMAP accounts on your Windows Mobile 6.1 device.

This behavior is associated with a feature that is introduced in Windows Mobile 6.1. The feature allows for mobile operators to specify an alternate SMTP server name that is used if e-mail messages cannot be sent by using the user-specified SMTP server name. If the mobile operator does not specify an alternate SMTP server name and if the Windows Mobile 6.1-based device does not connect, the e-mail account is corrupted and cannot send e-mail messages.

Microsoft has made this fix which should correct the issue:
http://www.microsoft.com/downloads/details.aspx?familyid=d9d71b2e-d2dd-44f2-86e5-1e53aad7fb7a&displaylang=en&tm

Special thanks to Johan from the BostonPocketPC for this tip

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