Hello,
I have found that most (all) of the mails sent with SmtpClient end in Junk mail folder. I have checked the difference between mail sent with Microsoft Outlook and with SmtpClient. The only important difference I can find lies in Received header. Mail sent with SmtpClient has one more Received header, and this is the header with my computer IP (local).
Received: from MyComputerName ([10.1.1.12]) by mail.XXX.si with Microsoft SMTPSVC(6.0.3790.1830); Thu, 3 Aug 2006 16:00:57 +0200
I think that because this address can't be verified, Microsoft outlook (and other) threat this as junk mail. This is quite big problem, because I'm not able to send ...
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