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Thank you all for clarification of the subject.
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Thank you all for clarification of the subject.

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<div class="content wysiwyg-content">
Hello,<br />
<br />
There is a VB script that sends out SMTP message, which is working fine.<br />
I execute the script from my Windows 7 workstation and I can receive email from my outlook or public email client ( gmail ).<br />
The remote SMTP server value in the script is set to my Exchange server.<br />
My Windows 7 ( actually any Windows 7 ) is not running SMTP service by default.<br />
My question is what kind of protocol/service on my local machine delivers my message to the remote SMTP server ( my Exchange )?<br />
Please see the attached code.<br />
<br />
Thank you for your help.<br />
<a href="https://filedb.experts-exchange.com/incoming/2011/10_w42/512501/notification.vbs" target="_blank" class="file-inline" title="SMTP message (926 bytes)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>notification.vbs</a>
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notification.vbs

Hello,

There is a VB script that sends out SMTP message, which is working fine.
I execute the script from my Windows 7 workstation and I can receive email from my outlook or public email client ( gmail ).
The remote SMTP server value in the script is set to my Exchange server.
My Windows 7 ( actually any Windows 7 ) is not running SMTP service by default.
My question is what kind of protocol/service on my local machine delivers my message to the remote SMTP server ( my Exchange )?
Please see the attached code.

Thank you for your help.

SMTP

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.