BizTalk Error: SMTP Adapter: Unknown Error Description

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SYMPTOMS

The error message in the event log as below:
A message sent to adapter "SMTP" on send port "Orders_1.0.0.0.Orders.Email_DynamicSendPort_e369e0033a074fb3" with URI "mailto:xxx@xxx.xxx" is suspended.

Error details: Unknown Error Description.

RESOLUTION

A known issue with the SMTP Adapter, especially with a dynamic port. Set a value to SMTP.EmailBodyTextCharset, you will work out the issue.

Sample Code:
msgEmail(SMTP.EmailBodyTextCharset) = “UTF-8”;