Function ValidateRecipients

internal/agent/api.go:1521–1521

validateRecipients ensures every entry in the joined To/CC/BCC slices is a syntactically valid RFC 5322 address. We use net/mail.ParseAddress rather than a custom regex because it handles bare local@domain, display-name forms ("Bob Smith "), quoted local parts, and IDN domains uniformly.

(groups ...[]string)

// ValidateRecipients is the exported seam over validateRecipients so the v1
// httpapi layer reuses the same RFC 5322 recipient check.
func ValidateRecipients(groups ...[]string) error { return validateRecipients(groups...) }

func validateRecipients(groups ...[]string) error {
	for _, group := range groups {