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MultiMail 2.0 - Freeware SMTP stress testing tool

, 3 Oct 2003
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This free program can be used to stress test SMTP servers. It also aids anti-Spam tool developers as a useful mail-bombardment tool.

About MultiMail 2.0

MultiMail 2.0 is a multi-threaded SMTP stress testing program which also doubles up as a handy tool for anti-Spam software development. It starts multiple threads, each sending a large number of mails in parallel to a specified SMTP server. MultiMail 2.0 is  freeware and can be used by anyone without the author's explicit permission.

How it came about?

Version 1.0

I wrote the first version while I was developing my own anti-Spam program Pop 3 Protector (discontinued). I used it to bombard test POP accounts with a large amount of email from multiple fake email addresses and with multiple subject headers.

A few months ago [here the current time is Feb 2002], I was asked to try out three different Linux based SMTP servers and decide on the fastest one. That's when I got a chance to use this tool once again. I sent huge amounts of mail through each server and recorded connection and mail delivery speeds. To increase the load I made the program multi-threaded. The user can set the number of threads to use. In this particular version I have restricted this number to 10, to prevent malicious people from misusing this program. But for anyone who wants to use this as an SMTP stress tester, 10 threads running in parallel, each thread sending 1000 mails each, should be quite good enough.

Actually there is a sneaky way to over-ride the restrictions, which is by running multiple instances of the program. But for some strange reason I have noticed that this will considerably slow down the user's machine and I hope that will deter people from trying it out.

Version 2.0

Version 2.0 uses the ATL7 SMTP and MIME classes and so I have removed all my Winsock-SMTP-chat code from the program. This has enabled me to add support for attachments which is quite handy.

Sending mail using the ATL7 classes

  • Include the required header file
  • #include <span class="code-keyword"><atlsmtpconnection.h></span>
  • Call CoInitialize
  • CoInitialize(0);
  • And write code similar to below snippet
  • CMimeMessage msg;
    CSMTPConnection conn;
    BOOL bSuccess = conn.SendMessage(msg);
  • Call CoUninitialize
  • CoUninitialize();


  • v1.0 - 22 Feb 2002
  • v2.0 - 05 Oct 2003


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Nish Nishant

United States United States
Nish is a real nice guy who has been writing code since 1990 when he first got his hands on an 8088 with 640 KB RAM. Originally from sunny Trivandrum in India, he has been living in various places over the past few years and often thinks it’s time he settled down somewhere.

Nish has been a Microsoft Visual C++ MVP since October, 2002 - awfully nice of Microsoft, he thinks. He maintains an MVP tips and tricks web site - where you can find a consolidated list of his articles, writings and ideas on VC++, MFC, .NET and C++/CLI. Oh, and you might want to check out his blog on C++/CLI, MFC, .NET and a lot of other stuff -

Nish loves reading Science Fiction, P G Wodehouse and Agatha Christie, and also fancies himself to be a decent writer of sorts. He has authored a romantic comedy Summer Love and Some more Cricket as well as a programming book – Extending MFC applications with the .NET Framework.

Nish's latest book C++/CLI in Action published by Manning Publications is now available for purchase. You can read more about the book on his blog.

Despite his wife's attempts to get him into cooking, his best effort so far has been a badly done omelette. Some day, he hopes to be a good cook, and to cook a tasty dinner for his wife.

Comments and Discussions

GeneralPeople who downloaded it before 26th Feb PinmemberNish [BusterBoy]26-Feb-02 13:37 
GeneralThanks PinmemberJames Pullicino26-Feb-02 3:58 
GeneralRe: Thanks PinmemberNish [BusterBoy]26-Feb-02 13:36 
GeneralRe: Thanks PinmemberJames Pullicino26-Feb-02 22:14 
Win2k Adv Server

(2b || !2b)
GeneralVolunteers required urgently!!! PinmemberNish [BusterBoy]24-Feb-02 1:25 
GeneralRe: Volunteers required urgently!!! PinmemberAnders Molin24-Feb-02 1:45 
GeneralRe: Volunteers required urgently!!! PinmemberNish [BusterBoy]24-Feb-02 6:18 
GeneralRe: Volunteers required urgently!!! PinmemberAnders Molin24-Feb-02 1:48 
GeneralRe: Volunteers required urgently!!! PinmemberNish [BusterBoy]24-Feb-02 2:34 
GeneralHmmm, buggy, and useless PinmemberAnders Molin23-Feb-02 6:06 

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