go get github.com/jetemail/jetemail-go

package main

import (
    "fmt"
    "github.com/jetemail/jetemail-go"
)

func main() {
    client := jetemail.New("your-transactional-api-key")

    result, err := client.Email.Send(&jetemail.SendEmailOptions{
        From:    "Your App <hello@yourdomain.com>",
        To:      "user@example.com",
        Subject: "Welcome!",
        HTML:    "<h1>Welcome!</h1>",
    })
    if err != nil {
        panic(err)
    }

    fmt.Println(result.ID)
}

// API key string
client := jetemail.New("your-transactional-api-key")

// Or with options
client := jetemail.New("your-transactional-api-key", jetemail.WithBaseURL("https://api.jetemail.com"))

result, err := client.Batch.Send([]*jetemail.SendEmailOptions{
    {
        From:    "you@example.com",
        To:      "alice@example.com",
        Subject: "Hello Alice",
        HTML:    "<p>Hi Alice!</p>",
    },
    {
        From:    "you@example.com",
        To:      "bob@example.com",
        Subject: "Hello Bob",
        HTML:    "<p>Hi Bob!</p>",
    },
})

result, err := client.Email.Send(&jetemail.SendEmailOptions{
    From:    "you@example.com",
    To:      "recipient@example.com",
    Subject: "Invoice",
    HTML:    "<p>Please find your invoice attached.</p>",
    Attachments: []jetemail.Attachment{
        jetemail.AttachmentFromPath("/path/to/invoice.pdf"),
        jetemail.AttachmentFromContent([]byte("Hello World"), "hello.txt"),
    },
})

result, err := client.Email.Send(&jetemail.SendEmailOptions{...})
if err != nil {
    var apiErr *jetemail.JetEmailError
    if errors.As(err, &apiErr) {
        fmt.Println(apiErr.StatusCode, apiErr.Message, apiErr.Response)
    }
}