Implement mailer and add welcome email for POP account

helpers/mailer.go

@@ -0,0 +1,49 @@
+package helpers
+
+import (
+	"github.com/wneessen/go-mail"
+)
+
+var mailer *mail.Client
+var mailerSet bool
+
+func GetMailer() (*mail.Client, error) {
+	if mailerSet {
+		return mailer, nil
+	}
+
+	config, err := GetConfig()
+	if err != nil {
+		return mailer, err
+	}
+
+	mailer, err = mail.NewClient(
+		config.Mail.Host,
+		mail.WithPort(config.Mail.Port),
+		mail.WithSMTPAuth(mail.SMTPAuthAutoDiscover),
+		mail.WithUsername(config.Mail.Username),
+		mail.WithPassword(config.Mail.Password),
+	)
+	if err != nil {
+		return mailer, err
+	}
+
+	mailerSet = true
+	return mailer, nil
+}
+
+func NewMessage() (*mail.Msg, error) {
+	msg := mail.NewMsg()
+
+	config, err := GetConfig()
+	if err != nil {
+		return msg, err
+	}
+
+	msg.FromFormat(
+		config.Mail.FromName,
+		config.Mail.FromAddress,
+	)
+
+	return msg, nil
+}