#450: don't invalidate email if dispositionNotificationTo should be used but the email for it was left empty. Idem for returnReceiptTo. Instead, allow fall-back to replyTo or From (which is already in place, but would never trigger because of the validation step)

Author: bbottema

modules/simple-java-mail/src/main/java/org/simplejavamail/mailer/MailerHelper.java

@@ -100,10 +100,6 @@ public static void validateCompleteness(final @NotNull EmailWithDefaultsAndOverr
 			throw new MailCompletenessException(MailCompletenessException.MISSING_RECIPIENT);
 		} else if (email.getFromRecipient() == null) {
 			throw new MailCompletenessException(MailCompletenessException.MISSING_SENDER);
-		} else if (TRUE.equals(email.getUseDispositionNotificationTo()) && email.getDispositionNotificationTo() == null) {
-			throw new MailCompletenessException(MailCompletenessException.MISSING_DISPOSITIONNOTIFICATIONTO);
-		} else if (TRUE.equals(email.getUseReturnReceiptTo()) && email.getReturnReceiptTo() == null) {
-			throw new MailCompletenessException(MailCompletenessException.MISSING_RETURNRECEIPTTO);
 		}
 	}