Switched to SMTP for email so I can use FastMail

lib/email.go

@@ -1,31 +1,102 @@
 package lib
 
 import (
-	"fmt"
+	"crypto/tls"
+	"log"
+	"net/smtp"
 	"os"
-
-	"github.com/resendlabs/resend-go"
 )
 
-var client *resend.Client
-
-// init function
-func init() {
-	client = resend.NewClient(os.Getenv("RESEND_API_KEY"))
-}
-
 func SendEmail(to_email string, from_email string, from_name string, html string, subject string) {
-	params := &resend.SendEmailRequest{
-		From:    from_name + "<" + from_email + ">",
-		To:      []string{to_email},
-		Html:    html,
-		Subject: subject,
+	log.Println("Starting email sending process")
+
+	// Set up authentication information.
+	auth := smtp.PlainAuth(
+		"",
+		os.Getenv("SMTP_USERNAME"),
+		os.Getenv("SMTP_PASSWORD"),
+		os.Getenv("SMTP_HOST"),
+	)
+
+	log.Println("Authentication set up")
+
+	// Connect to the server, authenticate, set the sender and recipient,
+	// and send the email all in one step.
+	msg := []byte("From: " + from_name + " <" + from_email + ">\r\n" +
+		"To: " + to_email + "\r\n" +
+		"Subject: " + subject + "\r\n" +
+		"Content-Type: text/html; charset=UTF-8" + "\r\n" +
+		"\r\n" +
+		html + "\r\n")
+
+	tlsconfig := &tls.Config{
+		InsecureSkipVerify: false,
+		ServerName:         os.Getenv("SMTP_HOST"),
 	}
 
-	sent, err := client.Emails.Send(params)
+	log.Println("TLS configuration set up")
+
+	c, err := smtp.Dial(os.Getenv("SMTP_HOST") + ":587")
 	if err != nil {
-		fmt.Println(err.Error())
+		log.Println("Error dialing SMTP server:", err)
 		return
 	}
-	fmt.Println(sent.Id)
+
+	log.Println("Connected to SMTP server")
+
+	if err = c.StartTLS(tlsconfig); err != nil {
+		log.Println("Error starting TLS:", err)
+		return
+	}
+
+	log.Println("TLS started")
+
+	if err = c.Auth(auth); err != nil {
+		log.Println("Error authenticating with SMTP server:", err)
+		return
+	}
+
+	log.Println("Authenticated with SMTP server")
+
+	if err = c.Mail(from_email); err != nil {
+		log.Println("Error setting sender address:", err)
+		return
+	}
+
+	log.Println("Sender address set")
+
+	if err = c.Rcpt(to_email); err != nil {
+		log.Println("Error setting recipient address:", err)
+		return
+	}
+
+	log.Println("Recipient address set")
+
+	w, err := c.Data()
+	if err != nil {
+		log.Println("Error getting write closer:", err)
+		return
+	}
+
+	log.Println("Got write closer")
+
+	_, err = w.Write(msg)
+	if err != nil {
+		log.Println("Error writing message:", err)
+		return
+	}
+
+	log.Println("Message written")
+
+	err = w.Close()
+	if err != nil {
+		log.Println("Error closing write closer:", err)
+		return
+	}
+
+	log.Println("Write closer closed")
+
+	c.Quit()
+
+	log.Println("Email sent successfully")
 }