refactor: project structure

internal/smtpclient/smtpclient.go

@@ -0,0 +1,39 @@
+package smtpclient
+
+import (
+	"crypto/tls"
+	"io"
+	"net/smtp"
+)
+
+type SMTPClient struct {
+	client smtp.Client
+}
+
+func (c *SMTPClient) Auth(a smtp.Auth) error {
+	return c.client.Auth(a)
+}
+
+func (c *SMTPClient) Close() error {
+	return c.client.Close()
+}
+
+func (c *SMTPClient) Data() (io.WriteCloser, error) {
+	return c.client.Data()
+}
+
+func (c *SMTPClient) Mail(from string) error {
+	return c.client.Mail(from)
+}
+
+func (c *SMTPClient) Quit() error {
+	return c.client.Quit()
+}
+
+func (c *SMTPClient) Rcpt(to string) error {
+	return c.client.Rcpt(to)
+}
+
+func (c *SMTPClient) StartTLS(config *tls.Config) error {
+	return c.client.StartTLS(config)
+}