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 essentially a wrapper over Cdosys. How can you send mails using Cdosys? Click here Why is one API able to send mail and the other fails?

There are new enhancements to SMTP support for .NET 4.0 - in the area of Unicode support and increased standards compliance, which is an important aspect in ensuring that legitimate emails do not get flagged as spam, as well as a few other useful features. + Decreased likelihood of being accidentally flagged as spam + Increased Unicode support + Clarification on setting header values + Multiple Reply-To addresses with the new property ReplyToList + Content Disposition time zones + Mail Address formats

Here is a sample vbscript using which we can get SMTP servers instance names in a particular domain pragmatically via ADSI. NOTE: Following programming examples is for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This sample code assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. This sample

In this we will see how to create & send e-mail messages using Exchange Web Service (EWS). It’s pretty simple with EWS to do. // Create the Exchange Service Binding ExchangeServiceBinding esb = new ExchangeServiceBinding(); // Add its relevant Credentials like user name, password, domain and URL esb.Credentials = new NetworkCredential(userName, Password, domain); esb.Url = @"https://myexchangeserver/EWS/Exchange.asmx" ; // CreateItemType and set its relevant properties/values CreateItemType request

Earlier we(programmers) use CDO or MAPI to retrieve the real SMTP address (like user@domain.com) of Exchange account. But with the new object model, retrieving the SMTP address of Exchange account is much easier; it’s as simple like the following steps:  Get the ExchangeUser object by using the GetExchangeUser method From the ExchangeUser, retrieve the PrimarySmtpAddress property. FYI, i have enclosed some of the relevant properties and objects, which can helps us to do more… AddressEntryUserType:

Recently I was working with a Customer who uses ASP & CDOSYS to send Unicode content e-mails. He had the following partial code-snippet: ... Set objMail = Server.CreateObject( "CDO.Message" ) 'Create CDO.Message Object Set objBodyPart = objmail.BodyPart 'Create BodyPart objBodyPart.Charset = "UTF-8" 'Set relevant Charset   Set objConf = Server.CreateObject( "CDO.Configuration" ) 'Create Configuration Object Set objFields = objConf.Fields 'and set its Configuration

You need to configure the user permissions to relay e-mail messages through the SMTP service. Do the following steps: Click Start , click Run , type inetmgr or open Internet Information Manager from Control Panel > Administrative Tools, and then click OK . Expand ComputerName , and then right-click a valid SMTP virtual server. Note The placeholder ComputerName represents the name of the local computer. Click Properties . On the Security tab, add the user account as an Operator, which you want

Assume that the computer on which this example will run has neither a SMTP service nor Microsoft Outlook® Express installed. In this case, you need to send the message through some SMTP service on the network and must configure the Message object completely. Further assume that the SMTP service through which you intend to send messages requires that you authenticate yourself using basic (clear-text) authentication. An instance of the Configuration Component Object Model (COM) class is created and

Transport agent implementation: In general the transport agent is implemented as a class that derives from either the SmtpReceiveAgent Class or the RoutingAgent Class . Every agent also needs a corresponding agent factory that derives from the SmtpReceiveAgentFactory Class or the RoutingAgentFactory Class , respectively. Then, what is the Transport Agent factories all about... The agent factory is the type that is specified when the agent is installed, and it is the only object that the transport

Recipients modified email messages (using event sink) sent from PICKUP folder and lands in the DROP folder ? The Pickup folder processes outgoing messages that are created as text files and then copied to the Pickup folder. When Request for Comments (RFC) 822 messages that are correctly formatted are copied to the Pickup folder, the SMTP service initiates delivery. In this replay method, the X-Sender envelope field and the X-Receiver envelope field are written to the e-mail message when the SMTP