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Summary:
Microsoft has several APIs which send email by SMTP. These 'SMTP Senders' are meant to send email to SMTP servers and do not have access to a mailboxes or public folders. Mail submitted by SMTP will not be saved into the Sent Items of the sender's mailbox. The beauty of these APIs is that they can send a lot of email very fast and do not need to go against Exchange or Outlook in order to work - they just need an SMTP server which will either pickup the email from its pickup folder or accept relay from the application using the API.
These APIs are used for sending mail via the SMTP protocol. These APIs are not Exchange or Outlook specific. They are shipped as either part of the Windows OS or with the .NET Framework.
The APIs:
Troubleshooting:
If you are running into issues with sending by SMTP port and don't believe its your code then code then be sure to check to be sure the issue is not with the SMTP server or permissions:
XFOR: Telnet to Port 25 to Test SMTP Communication
https://support.microsoft.com/en-us/kb/153119
How to Use Telnet to Test SMTP Communication
https://technet.microsoft.com/en-us/library/aa995718(v=exchg.65).aspx
Some Points Of Interest:
Also see:
About: Messaging APIs
https://blogs.msdn.com/b/webdav_101/archive/2015/08/07/about-messaging-apis.aspx
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