TF-3674 Add ADR for logic reply email

Signed-off-by: dab246 <tdvu@linagora.com>

docs/adr/0053-patrol-integration-test.md

@@ -1,4 +1,4 @@
-# 52. Patrol integration test
+# 53. Patrol integration test
 
 Date: 2024-04-10
 

docs/adr/0054-standardize-html-sanitizing.md

@@ -1,4 +1,4 @@
-# 53. Standardize HTML sanitizing
+# 54. Standardize HTML sanitizing
 
 Date: 2024-10-24
 

docs/adr/0055-web-socket-data-synchronization.md

@@ -1,4 +1,4 @@
-# 53. Web socket data synchronization
+# 55. Web socket data synchronization
 
 Date: 2024-11-10
 

docs/adr/0056-update-flutter-service-worker-initialization.md

@@ -1,4 +1,4 @@
-# 54. Update Flutter Service Worker Initialization
+# 56. Update Flutter Service Worker Initialization
 
 Date: 2024-11-15
 

docs/adr/0057-ios-fcm-routing.md

@@ -1,4 +1,4 @@
-# 55. iOS FCM routing
+# 57. iOS FCM routing
 
 Date: 2024-12-05
 

docs/adr/0058-remove-flutter-service-worker.md

@@ -1,4 +1,4 @@
-# 55. Remove Flutter Service Worker
+# 58. Remove Flutter Service Worker
 
 Date: 2024-11-26
 

docs/adr/0059-web-socket-ping-strategy.md

@@ -1,4 +1,4 @@
-# 56. Web Socket Ping Strategy
+# 59. Web Socket Ping Strategy
 
 Date: 2024-12-16
 

docs/adr/0060-team-mailboxes-matching.md

@@ -1,4 +1,4 @@
-# 57. Team Mailboxes Matching
+# 60. Team Mailboxes Matching
 
 Date: 2025-02-18
 

docs/adr/0061-fix-ios-email-view-gone-blank-with-large-html-content.md

@@ -1,4 +1,4 @@
-# 58. Fix iOS email view gone blank with large HTML content
+# 61. Fix iOS email view gone blank with large HTML content
 
 Date: 2024-04-05
 

docs/adr/0062-fix-offline-cache-prevents-updating-email-query-view-on-mobile.md

@@ -1,4 +1,4 @@
-# 58. Fix offline cache prevents updating email query view on mobile
+# 62. Fix offline cache prevents updating email query view on mobile
 
 Date: 2025-04-03
 

docs/adr/0063-hide-session-expires-dialog-to-avoid-confusing-users..md

@@ -1,4 +1,4 @@
-# 58. Hide session expires dialog to avoid confusing users
+# 63. Hide session expires dialog to avoid confusing users
 
 Date: 2025-04-14
 

docs/adr/0064-reply-to-own-sent-email.md

@@ -1,4 +1,4 @@
-# 59. Reply to own sent email
+# 64. Reply to own sent email
 
 Date: 2025-04-15
 

docs/adr/0065-logic-for-reply-email.md

@@ -0,0 +1,98 @@
+# 65. Logic for reply email
+
+Date: 2025-04-21
+
+## Status
+
+Accepted
+
+## Context
+
+- The email reply logic is quite complex so to avoid mistakes and regression of errors later.
+
+## Decision
+
+Brief the logic flow to easily follow changes during email reply process:
+
+**1. Reply:**
+
+- If the user is the `sender`
+
+```console
+To = email.to
+Cc, Bcc, ReplyTo = Empty
+```
+
+- Otherwise, If the email has a `List-Post` header then:
+
+```console
+To = email.from.withoutUser
+Cc, Bcc, ReplyTo = Empty
+```
+
+- Otherwise, If the email without a `List-Post` header, `email.replyTo` is not empty then:
+
+ ```console
+To = email.replyTo.withoutUser
+Cc, Bcc, ReplyTo = Empty
+```
+
+- Otherwise:
+
+```console
+To = email.from.withoutUser
+Cc, Bcc, ReplyTo = Empty
+```
+
+**2. Reply To List:**
+
+- If the email has a `List-Post` header then:
+
+```console
+To = email.List-Post.withoutUser
+Cc, Bcc, ReplyTo = Empty
+```
+
+- Otherwise: There is no `Reply To List` feature
+
+3. Reply all
+
+- If the user is the sender
+
+```console
+To = email.to.withoutUser
+Cc = email.cc.withoutUser
+Bcc = email.bcc.withoutUser
+ReplyTo = email.replyTo.withoutUser
+```
+
+- Otherwise, If the email has a `List-Post` header then:
+
+```console
+To = (email.replyTo + email.from + email.to).withoutUser
+Cc = email.cc.withoutUser
+Bcc = email.bcc.withoutUser
+ReplyTo = Empty
+```
+
+- Otherwise, If the email without a `List-Post` header, `email.replyTo` is not empty then:
+
+```console
+To = (email.replyTo + email.to).withoutUser
+Cc = email.cc.withoutUser
+Bcc = email.bcc.withoutUser
+ReplyTo = Empty
+```
+
+- Otherwise
+
+```console
+To = (email.from + email.to).withoutUser
+Cc = email.cc.withoutUser
+Bcc = email.bcc.withoutUser
+ReplyTo = Empty
+```
+
+## Consequences
+
+- Any changes to reply email should be updated in this ADR.