Just a quickie today... if you get an ArgumentException when setting the subject on the .Net MailMessage object (or on the constructor) like this...
System.ArgumentException: The specified string is not in the form required for a subject.
You'll want to cleanse your string input for non-printable characters. The most likely culprit is a carriage return or line feed. Which is "\r" or "\n" to the C# developers :)
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