Save mailmessage as an EML file (C # + smtpclient)

Source: Internet
Author: User
Tags smtpclient

. Net has greatly improved the mail. smtpclient function since 2.0. It is easy to send emails. However, the US lacks the ability to save the email content as an EML file.

In fact, smtpclient and mailmessage have implemented this function, but this function is nonpublic and invisible outside the space.

Use reflector to decompile system. net. Mail. smtpclient. You can see:


In the send (mailmessage) method,Mailwriter filemailwriter = This. getfilemailwriter (this. pickupdirectorylocation );

Let's continue positioning.GetfilemailwriterThis method

The above code is highlighted. EmlAfter reading the logic, we can see that before smtpclient. Send, Mr also became a temporary EML file and then sent it out.

The key is in new mailwriter (New filestream (str2, filemode. createnew.

Next we will find our coreMailwriter:

As we can see from the above, mailwriter is an internal class, so we can't see it in the namespace that calls mail. smtpclient and so on. We need to use it now.Reflection(Reflection.

The complete implementation code is provided below:

/// <Summary> /// save mailmessage as an EML file // </Summary> /// <Param name = "MSG"> the mailmessage with content to be saved </param> /// <Param name = "emlfileabsolutepath"> path of the saved EML file </param> static void savetoeml (mailmessage MSG, string emlfileabsolutepath) {const bindingflags flags = bindingflags. instance | bindingflags. nonpublic | bindingflags. flattenhierarchy; using (memorystream MS = new memorystream () {Assembly = typeof (system. net. mail. smtpclient ). assembly; Type tmailwriter = assembly. getType ("system. net. mail. mailwriter "); object mailwriter = activator. createinstance (tmailwriter, flags, null, new object [] {MS}, cultureinfo. invariantculture); MSG. getType (). getmethod ("send", flags ). invoke (MSG, new object [] {mailwriter, true}); file. writealltext (emlfileabsolutepath, system. text. encoding. default. getstring (Ms. toarray (), system. text. encoding. default );}}



MailMessage msg = new MailMessage();msg.Subject = "hello, i am deltacat";msg.From = new MailAddress("");msg.To.Add("");msg.Body = "welcome to";SaveToEml(msg, @"d:\test.eml");


Good luck!

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.