When the SMTP adapter sends an email message in which the subject line does not contain extended characters in Microsoft BizTalk Server 2010, the SMTP adapter still uses MIME, Unicode, or Base64 to encode the subject line.
Note This behavior complies with Request for Comments (RFC) 2047 and RFC 2231. For more information about RFC 2047 and RFC 2231, visit the following Internet Engineering Task Force (IETF) website:
This hotfix adds an option to let you disable the encoding of the subject line in the SMTP adapter of BizTalk Server 2010.
Cumulative update information
The hotfix that resolves this issue is included in cumulative update package 2 for BizTalk Server 2010.
For more information about how to obtain the cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:
2573000 Cumulative update package 2 for BizTalk Server 2010
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
To apply this hotfix, you must create the DisableSMTPSubjectEncoding registry key, and then set the DWORD value to 1 or to a value that is greater than 1 value. To do this, follow these steps:
Open Registry Editor. To open Registry Editor, click Start, type regedit in the Start Search box, and then press ENTER.
Locate and then click the following registry subkey on an x86-based computer: