Added isEncrypted

e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/mail/MailReader.kt

@@ -111,6 +111,7 @@ class MailReader(
                 return MailWithInvoice(
                     message.from?.joinToString(), message.subject ?: "",
                     message.sentDate?.let { map(it) }, map(message.receivedDate), message.messageNumber,
+                    parts.any { it.mediaType == "application/pgp-encrypted" },
                     getPlainTextBody(parts), getHtmlBody(parts),
                     attachmentsWithEInvoice
                 )

e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/mail/MailWithInvoice.kt

@@ -16,6 +16,7 @@ class MailWithInvoice(
      * -> use with care. Message numbers are not valid / the same anymore after expunge.
      */
     val messageNumber: Int,
+    val isEncrypted: Boolean = false,
     val plainTextBody: String?,
     val htmlBody: String?,
     val attachmentsWithEInvoice: List<MailAttachmentWithEInvoice>