Why doesn't my Go program use the SMTP library correctly?

As an efficient, concise, and highly concurrency programming language, Go language has a wide range of applications in various fields. As a classic application scenario in network programming, email sending has also received official support from the Go language and the development of a large number of community libraries. Among them, the SMTP (Simple Mail Transfer Protocol) library is one of the commonly used mail sending libraries. However, many beginners will encounter various problems when using the SMTP library to send emails. This article will introduce several common problems and solutions on the topic of "Why can't my Go program use the SMTP library correctly?" method.

Question 1: SMTP authentication failed

In order to prevent a large number of spam emails, the SMTP server strictly verifies the identity of the sender and requires SMTP authentication. If the email sent by the Go program does not pass authentication, the SMTP server will return an error message, causing the email to fail to be sent.

Solution:

When using the SMTP library to send emails, you generally need to provide the username and password information of the SMTP server. If authentication fails, a common reason is that the SMTP server has set security options and requires an encrypted connection through SSL or TLS. You can set the corresponding encryption options when initializing the SMTP client, or use an SMTP library that supports SSL/TLS connections (such as gomail).

Question 2: The email content is empty

When the SMTP library sends an email, it needs to set the email subject, sender, recipient and other information, as well as the email body. If the email body is empty, the SMTP library will send a blank email.

Solution:

When setting the email body, you should ensure that the content is not empty and the format is correct. If you use HTML-formatted emails, you can also perform format checking and verification before sending.

Problem 3: Mail is sent slowly or times out

When sending mail, sometimes there will be network abnormalities or the SMTP server does not respond in time, resulting in slow mail sending or even timeout failure.

Solution:

You can set the timeout period of the SMTP client to ensure that the email is sent within the specified time. In addition, the response of the SMTP server can also be monitored and tested to determine network conditions and server busyness.

To sum up, the SMTP library is one of the commonly used email sending libraries in the Go language. When using the SMTP library, you need to pay attention to ensuring successful SMTP authentication, correct email content format, and stable network connection to ensure the reliability and efficiency of email sending. I believe that after mastering the solution, your Go program will be able to correctly use the SMTP library to send emails.

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