SMTP 2000/2003 Provider and html e-mail

[jjd33]

OS: Win SBS 2003 With Exchange Server running
E-mail client: Outlook 2003
avast! SBS Edition

Has anyone come across the following problem ?
When the SMTP resident provider is running all incoming html e-mails are delivered as attachments. (even when the html message is located in the body of the e-mail)
When the SMTP resident provider has been stopped, incoming html e-mails are delivered normally. ie: When the html message is located in the body of the e-mail it is delivered as such, not as an attachment.

Any suggestion about the cause of this behavior would be welcome

[Wizard17]

OS: Win SBS 2003 With Exchange Server running
E-mail client: Outlook 2003
avast! SBS Edition

Has anyone come across the following problem ?
When the SMTP resident provider is running all incoming html e-mails are delivered as attachments. (even when the html message is located in the body of the e-mail)
When the SMTP resident provider has been stopped, incoming html e-mails are delivered normally. ie: When the html message is located in the body of the e-mail it is delivered as such, not as an attachment.

Any suggestion about the cause of this behavior would be welcome

Is there an update on this issue? One year later I have the same problem? Scanned most of these fora but couldn't find anything...