feat: add governed postbox delivery and report hardening

src/govoplan_campaign/backend/messages/builder.py

@@ -33,6 +33,7 @@ from govoplan_campaign.backend.campaign.models import (
     ZipArchiveConfig,
     ZipPasswordMode,
     ZipPasswordScope,
+    effective_delivery_channel_policy,
 )
 from govoplan_campaign.backend.campaign.template_values import build_template_values
 from govoplan_campaign.backend.services.zip_service import create_zip_archive
@@ -425,8 +426,14 @@ def _attach_files(
 
     return attached_count
 
-def _imap_initial_status(config: CampaignConfig) -> ImapStatus:
-    if config.delivery.imap_append_sent.enabled:
+def _imap_initial_status(
+    config: CampaignConfig,
+    entry: EntryConfig,
+) -> ImapStatus:
+    if (
+        effective_delivery_channel_policy(config, entry).uses_mail
+        and config.delivery.imap_append_sent.enabled
+    ):
         return ImapStatus.PENDING
     return ImapStatus.NOT_REQUESTED
 
@@ -520,7 +527,11 @@ def _message_draft(
         send_status = SendStatus.SKIPPED
         imap_status = ImapStatus.SKIPPED
     if imap_status is None:
-        imap_status = _imap_initial_status(config) if build_status == BuildStatus.BUILT else ImapStatus.SKIPPED
+        imap_status = (
+            _imap_initial_status(config, entry)
+            if build_status == BuildStatus.BUILT
+            else ImapStatus.SKIPPED
+        )
     return MessageDraft(
         entry_index=entry_index,
         entry_id=entry.id,
@@ -529,6 +540,10 @@ def _message_draft(
         validation_status=validation_status,
         send_status=send_status,
         imap_status=imap_status,
+        delivery_channel_policy=effective_delivery_channel_policy(
+            config,
+            entry,
+        ).value,
         subject=subject,
         from_=_message_address(context.sender),
         from_all=_message_addresses(context.senders),
@@ -809,17 +824,19 @@ def build_entry_message(
     if not entry.active:
         return _inactive_entry_message(config=config, entry=entry, entry_index=entry_index, context=context)
 
-    context.validation_status = _validate_required_sender(
-        context.senders,
-        context.issues,
-        context.validation_status,
-    )
-    context.validation_status = _validate_required_recipients(
-        config,
-        context.recipients,
-        context.issues,
-        context.validation_status,
-    )
+    channel_policy = effective_delivery_channel_policy(config, entry)
+    if channel_policy.uses_mail:
+        context.validation_status = _validate_required_sender(
+            context.senders,
+            context.issues,
+            context.validation_status,
+        )
+        context.validation_status = _validate_required_recipients(
+            config,
+            context.recipients,
+            context.issues,
+            context.validation_status,
+        )
     rendered = _render_message_template(config, campaign_file, entry)
     context.validation_status = _validate_rendered_template(
         config,