When it comes to integrating email sending and receiving capabilities into a desktop application, there are several options available. Here are some of the most commonly used approaches: 1. Third-Party Email Client Libraries One option is to leverage third-party email client libraries, such as MailKit or OpenPop.NET. These libraries provide a set of functions and classes that handle the email protocols (SMTP, POP3, and IMAP) and allow you to send, receive, and manage emails within your desktop application. They offer a high level of flexibility and control over the email integration process. 2. Email Service Providers’ APIs Another option is to use the APIs provided by popular email service providers, such as Gmail API or Microsoft Graph API. These APIs offer extensive functionalities for email integration, including sending, receiving, and managing emails, as well as accessing contacts, calendars, and other related data. They provide a more streamlined and secure approach, as the email service provider takes care of the underlying email protocols. 3. Built-in Programming