How to Send Emails in C# using SMTP and email API

C# applications can send email primarily through SMTP using .NET, although the older System.Net.Mail SmtpClient approach is no longer recommended for new projects because of limited support for modern protocols. The preferred alternative is MailKit, a cross-platform .NET library installed through NuGet that supports authenticated SMTP sending as well as POP3 and IMAP email retrieval. MailKit can create plain-text or HTML messages, embed linked images, add file attachments, and address multiple recipients through MIME-based message classes. The material also presents Mailtrap Email Sending as a third-party API and SMTP service that provides delivery analytics, alerts, logs, webhooks, dedicated IP options, and high-volume sending capabilities after account and domain verification.

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