service/email.md

@@ -946,8 +946,9 @@ domain. Inbound mail filters are expected to improve that situation
 ## Technical debt and next steps
 
 The next step in this project is to rebuild a proposal to followup on
-the long term plan from TPA-RFC-44. This will mean either outsourcing
-mail services or building a proper mail hosting service.
+the long term plan from TPA-RFC-44 (TPA-RFC-45, [issue
+tpo/tpa/team#41009](https://gitlab.torproject.org/tpo/tpa/team/-/issues/41009)). This will mean either outsourcing mail
+services or building a proper mail hosting service.
 
 ## Proposed Solution
 
@@ -960,6 +961,7 @@ time:
    favor of TPA-RFC-44 and following)
  * [TPA-RFC-44: Email emergency recovery](policy/tpa-rfc-44-email-emergency-recovery) (DKIM, SPF, DMARC
    records, long term plan postponed)
+ * TPA-RFC-45: Mail architecture (long term plans from TPA-RFC-44)
 
 ## Submission server proposal