Does Windows Server 2003 SMTP mail server have a character limit for the subject?

I am using Windows 2003 Server and I'm wondering if the SMTP m开发者_运维技巧ail service that is part of IIS (v6.0) has a character limit on the subject line?

It shouldn't; not according to RFC 2822

It's not SMTP or IIS, but the underlying message that determines the subject. SMTP is the application layer transport protocol, which abstracts the sending of the e-mail message. IIS does funky things, but shouldn't break standards.