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Go
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import ( "fmt" "net" "net/mail" "strings"
"github.com/resend/resend-go/v3")
type Email struct { From string To string Subject string Text string Html string APIKey string}
func SendEmail(email Email) error { client := resend.NewClient(email.APIKey) _, err := client.Emails.Send(&resend.SendEmailRequest{ From: email.From, To: []string{email.To}, Subject: email.Subject, Text: email.Text, Html: email.Html, }) if err != nil { return fmt.Errorf("error sending email: %w", err) } return nil}
// AddNewsletterContact creates a global contact in Resend and adds them to the newsletter segment.func AddNewsletterContact(apiKey, segmentID, emailAddr string) error { client := resend.NewClient(apiKey) _, err := client.Contacts.Create(&resend.CreateContactRequest{ Email: emailAddr, }) if err != nil { return fmt.Errorf("error creating contact: %w", err) } _, err = client.Contacts.Segments.Add(&resend.AddContactSegmentRequest{ SegmentId: segmentID, Email: emailAddr, }) if err != nil { return fmt.Errorf("error adding contact to newsletter segment: %w", err) } return nil}
func IsValidEmail(email string) bool { // Reject whitespace (ParseAddress normalizes it away) if strings.ContainsAny(email, " \t\n\r") { return false }
// Use stdlib RFC 5322 parser addr, err := mail.ParseAddress(email) if err != nil { return false }
// Split email into local and domain parts parts := strings.Split(addr.Address, "@") domain := parts[1]
canonical := coalesceToCanonicalName(domain) mx, err := net.LookupMX(canonical)
// Don't check err here; mx will only contain valid mx records, and we should // only fallback to an implicit mx if there are no mx records defined (whether // they are valid or not). if len(mx) != 0 { return true }
if err != nil { // If the domain resolves to an address, assume it's an implicit mx. address, _ := net.LookupIP(canonical) if len(address) != 0 { return true } }
return false}
func coalesceToCanonicalName(domain string) string { canonical, err := net.LookupCNAME(domain) if err != nil { // net.LookupCNAME() returns an error if there is no cname record *and* no // a/aaaa records, but there may still be mx records. return domain } return canonical}