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does someone experienced situation when email sent to gmail with missing message-id param has dissapeared or delivered after very long time? Few of my clients reported similar situation and I've checked this a little and message sent using webmail or smtp connection from Thunderbird had proper Message-ID attrib in header:
but message sent from simple C# code ended with Message-ID:
on delivered message. Does someone heard about having missing Message-Id causing some problems? If yes then is there any chance to generate Message-Id by SmarterMail when message which is be sent does not have it?