package koushin import ( "fmt" "github.com/emersion/go-smtp" ) func (s *Server) dialSMTP() (*smtp.Client, error) { if s.smtp.host == "" { return nil, fmt.Errorf("SMTP is disabled") } var c *smtp.Client var err error if s.smtp.tls { c, err = smtp.DialTLS(s.smtp.host, nil) if err != nil { return nil, fmt.Errorf("failed to connect to SMTPS server: %v", err) } } else { c, err = smtp.Dial(s.smtp.host) if err != nil { return nil, fmt.Errorf("failed to connect to SMTP server: %v", err) } if !s.smtp.insecure { if err := c.StartTLS(nil); err != nil { c.Close() return nil, fmt.Errorf("STARTTLS failed: %v", err) } } } return c, err }