How to Compose and Send Emails Effectively Using the Gmail Go SDK?

Composing Emails using the Gmail Go SDK

Creating and sending emails via the Gmail Go SDK can be a challenging task due to limited documentation. This article provides a walkthrough for constructing and dispatching emails efficiently.

The Message Payload

To create a new email, the Message structure must be populated. The essential field is Payload, which accepts a MessagePart type.

Generating the MessagePart Payload

The MessagePart encompasses multiple headers and a body. To specify the sender, recipient, and subject, utilize the MessagePartHeader struct.

For the body, the MessagePartBody is required. However, instead of using directly, a workaround involves concatenating appropriate MIME headers with the email content:

var msg string
msg += fmt.Sprintf("From: %s\r\n", from.String())
msg += fmt.Sprintf("To: %s\r\n", to.String())
msg += fmt.Sprintf("Subject: %s\r\n", encodeRFC2047(em.Subject))
msg += "MIME-Version: 1.0\r\n"
msg += "Content-Type: text/html; charset=\"utf-8\"\r\n"
msg += "Content-Transfer-Encoding: base64\r\n\r\n"
msg += em.Message

Encoding the Raw Message

Finally, assign this constructed message to the Raw field of the Message structure. Encode the raw message using encodeWeb64String() and set it to the Raw field.

Conclusion

By employing these techniques, developers can successfully compose and send emails through the Gmail Go SDK. While the documentation can be limited, these steps provide a detailed guide for effective email creation and transmission.

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