System.Net.Mail.SmtpClient.Send() Error: An invalid character was found in the mail header #2


I get This error when trying to send mailMessage. The problem wasn't there until today.

Until today I developed my webside on Windows XP machine, Today I moved it to a new machine of Windows Vista Ultimate and the same Code on vista produce an error (same as you mentioned)

Need Help.



10/14/2008 5:27:52 PM 91979 articles. 4 followers. Follow

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What character set are you using? Try setting the encoding to



Narmatha Balasundaram
10/14/2008 7:37:44 PM

I tried to set the subject and body encoding to UTF8 with no luck.

 The thing is that the code works fine on Windows XP but not on windows Vista.

maybe it's a machine problem.

10/14/2008 8:27:12 PM

This might help you -

Narmatha Balasundaram
10/14/2008 8:35:25 PM

I appriciate your help, but the link is something that I wrote 1 hour ago in order to get answers for this issue from Microsoft Experts.

10/14/2008 8:42:16 PM


 I solved the problem:

 It was a machine problem, The Computer Name had hebrew letters in it (came from the computer store who install the windows vista).

 I changed the computer name to include only english letters and the windows user name also to include english letters.


10/15/2008 6:55:57 PM

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