GODT-948 Embedded messages

test/features/bridge/smtp/send/embedded_message.feature

@@ -0,0 +1,38 @@
+Feature: SMTP sending embedded message
+  Scenario: Send it
+    Given there is connected user "user"
+    And there is SMTP client logged in as "user"
+    When SMTP client sends message
+      """
+      From: Bridge Test <[userAddress]>
+      To: Internal Bridge <bridgetest@protonmail.com>
+      Subject: Embedded message
+      Content-Type: multipart/mixed; boundary="boundary"
+
+      This is a multi-part message in MIME format.
+      --boundary
+      Content-Type: text/plain; charset=utf-8
+      Content-Transfer-Encoding: 7bit
+
+
+      --boundary
+      Content-Type: message/rfc822; name="embedded.eml"
+      Content-Transfer-Encoding: 7bit
+      Content-Disposition: attachment; filename="embedded.eml"
+
+      From: Bar <bar@example.com>
+      To: Bridge Test <bridgetest@pm.test>
+      Subject: (No Subject)
+      Content-Type: text/plain; charset=utf-8
+      Content-Transfer-Encoding: quoted-printable
+
+      hello
+
+      --boundary--
+
+
+      """
+    Then SMTP response is "OK"
+    And mailbox "Sent" for "user" has messages
+      | from          | to                        | subject          |
+      | [userAddress] | bridgetest@protonmail.com | Embedded message |