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Not sure developers using System.Net.Mail are not complaining about this issue? The issue is very easy to reproduce, all you need to do is create a new mail with someone on Bcc and drop it to the Pickup folder In Exchange. Most likely not to many people use Bcc or use Port instead of Pickup. MailMessage...

This was a fun issue to work on! Some background, the customer was using System.Net.Mail to send out mails via Exchange 2007 using port 25 and port 587, all was working fine and then some updates were installed and he was no longer able to send out mails via port 587. He started to get the following...

Error: “The transport failed to connect to the server”, Code:80040213, Source:CDO.Message.1. Does that look familiar? This was something that I kept running into while trying to send mail using CDOSYS with SSL/TLS enabled. Vikas already has a post explaining some of the details that you could refer to...

The error CDO.Message.1 (0x80040220) -The "SendUsing" configuration value is invalid is back again on IIS 7.5 and the reasons are also the same! inadequate permissions on the IIS Metabase due to which CDOSYS is unable to read the location of the Pickup Directory from the IIS Metabase. What...

I recently ran into an issue where one of my customer was unable to send mail using System.Net.Mail(.Net 2.0), we always got the "Authentication failed" error. We tried sending mail using Microsoft CDO for Windows 2000 Library(Cdosys) and System.Web.Mail and the mails went just fine. if Cdosys...