SMTP in C#

What is SMTP (Simple Mail Transfer Protocol)?

SMTP (Simple Mail Transfer Protocol) is an application layer. SMTP is under the TCP/IP protocol. It's a communication protocol used for transmitting email messages over the Internet. SMTP used in sending and receiving email.

How does SMTP work?

SMTP is sending emails between servers on the internet.

Behind the scenes when email client send an email. Once connect with server so during few time exchange information or data. After that mail transfer agent then checks if both email addresses are from the same email domain. If they're from the same domain, the email is sent; if not, the server uses the domain name system (DNS) to identify the recipient's domain and then sends it to the correct server.

Use SMTP in C#

You can use SMTP in C sharp to send email. Firstly SmtpClient class from the System.Net.Mail namespace to send emails.

Below is a basic example of how to send an email using SMTP in C#.