Exchange 2007:Transport error when sending emails using TLS (0x80040213)

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 but there are some more finer points…

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Error:CDO.Message.1 (0x80040220) The "SendUsing" configuration value is invalid on IIS 7.5

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 has changed? The default Application Pool Identity…

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System.Net.Mail unable to Authenticate against some third party SMTP Servers

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 works System.Web.Mail(SWM) would normally work because SWM is…

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