Golang mailer

In Go, there are several libraries that can be used to send emails. Here are a few popular ones:

1. Gomail: Gomail is a popular Go library for sending emails. It provides a simple and easy-to-use API for sending emails using SMTP.
2. Sendgrid: Sendgrid is a cloud-based email service that provides a Go library for sending emails. It offers features such as email tracking, analytics, and spam filtering.
3. Mailgun: Mailgun is another cloud-based email service that provides a Go library for sending emails. It offers features such as email tracking, analytics, and spam filtering.
4. Gin-Mailer: Gin-Mailer is a Go library that provides a simple and easy-to-use API for sending emails using SMTP. It is designed to work with the Gin web framework.
5. Email: Email is a Go library that provides a simple and easy-to-use API for sending emails using SMTP. It is designed to work with the net/http package.

Here is an example of how to use Gomail to send an email:

package main

import (
    "fmt"
    "log"

    "github.com/jordan-wright/email"
)

func main() {
    // Create a new email object
    e := &email.Email{
        To: []string{"[email protected]"},
        From: "[email protected]",
        Subject: "Hello",
        Body: []byte("Hello, this is a test email"),
    }

    // Set the SMTP server
    e.SetSMTP("smtp.example.com:587", "username", "password")

    // Send the email
    if err := e.Send(); err!= nil {
        log.Println(err)
        return
    }

    fmt.Println("Email sent successfully!")
}

And here is an example of how to use Sendgrid to send an email:

package main

import (
    "fmt"
    "log"

    "github.com/sendgrid/sendgrid-go"
    "github.com/sendgrid/sendgrid-go/helpers/mail"
)

func main() {
    // Create a new Sendgrid client
    client := sendgrid.NewSendClient("YOUR_SENDGRID_API_KEY")

    // Create a new email object
    from := mail.NewEmail("[email protected]", "Sender Name")
    to := mail.NewEmail("[email protected]", "Recipient Name")
    subject := "Hello"
    body := "Hello, this is a test email"

    // Create a new Sendgrid message
    message := mail.NewV3Mail()
    message.SetFrom(from)
    message.AddTo(to)
    message.SetSubject(subject)
    message.AddContent("text/plain", body)

    // Send the email
    response, err := client.Send(message)
    if err!= nil {
        log.Println(err)
        return
    }

    fmt.Println(response.StatusCode)
    fmt.Println(response.Body)
}

Note that you will need to replace the placeholders (e.g. YOUR_SENDGRID_API_KEY) with your actual Sendgrid API key.