Simple SMTP Client Design | Network Programming for Microsoft Windows , Second Edition (Microsoft Programming Series)
Simple Mail Transfer Protocol - Wikipedia
FakeSMTP – FakeSMTP - Dummy SMTP server for developers
MS-SMTPNTLM]: SMTP Client Successfully Authenticating to an SMTP Server | Microsoft Docs
Simple Mail Transfer Protocol (SMTP) - GeeksforGeeks
cs-SmtpClient/README.md at master · TakeAsh/cs-SmtpClient · GitHub
What is SMTP - smtp mail server - professional SMTP service provider
Direct send without SMTP relay server
Simple Mail Transfer Protocol(SMTP) and SMTP Server – disamTECHbench
Support for sending mail via an SMTP server vs. an email client
Send Mail Client: Simple SMTP Client
Which SMTP Port to Use for Email? Common Email Ports | SparkPost
New SMTP client for sending Internet mail - IBM MediaCenter
Notification Sender 2222 Error with Server response "5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM" — Knowledge Base
SMTP Client Supporting Implicit SSL Secure Sockets Layer with OAuth2 Open Authorization or Password Authorization (2.0) - CodeProject