You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mail.go
    path of file: ./repos/corteza/server/pkg/mail
    
    the code of the file until where you have to start completion: package mail

import (
	"fmt"
	"regexp"
	"strconv"
	"strings"

	gomail "gopkg.in/mail.v2"
)

type (
	Dialer interface {
		DialAndSend(...*gomail.Message) error
	}

	applyCfg func(*gomail.Dialer)
)

const (
	addressCheckRE = "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-
    
func Send(message *gomail.Message, dd ...Dialer) (err error) {
	for _, d := range append(dd, defaultDialer) {
		if d == nil {
			continue
		}

		if err = d.DialAndSend(message); err != nil {
			return fmt.Errorf("could not send email: %w", err)
		} else {
			return nil
		}
	}

	// At this point, none of the dialer could be used,
	// is there an error with default dialer?
	if defaultDialerError != nil {
		return fmt.Errorf("could not send email: %w", defaultDialerError)
	}

	return fmt.Errorf("unable to find configured and working SMTP dialer")

}