Updated IMAP autolearn behaviour to deal with Apple Mail's shenanigans

crates/common/src/config/spamfilter.rs

@@ -451,21 +451,24 @@ impl PyzorConfig {
 
 impl ClassifierConfig {
     pub fn parse(config: &mut Config) -> Option<Self> {
-        if !config
-            .property_or_default("spam-filter.classifier.enable", "true")
-            .unwrap_or(true)
-        {
+        let ccfh = match config.value("spam-filter.classifier.model") {
+            Some("ftrl-fh") | None => false,
+            Some("ftrl-ccfh") => true,
+            Some("disabled") => return None,
+            Some(other) => {
+                config.new_build_error(
+                    "spam-filter.classifier.model",
+                    format!("Invalid model type: {}", other),
+                );
                 return None;
             }
+        };
 
         let w_params = FtrlParameters::parse(config, "spam-filter.classifier.parameters", 20);
-        let i_params = if config
-            .property_or_default("spam-filter.classifier.ccfh.enable", "false")
-            .unwrap_or(false)
-        {
+        let i_params = if ccfh {
             Some(FtrlParameters::parse(
                 config,
-                "spam-filter.classifier.ccfh.parameters",
+                "spam-filter.classifier.parameters.ccfh",
                 w_params.feature_hash_size - 2,
             ))
         } else {

crates/email/src/message/ingest.rs

@@ -7,7 +7,7 @@
 use super::crypto::{EncryptMessage, EncryptMessageError};
 use crate::{
     cache::{MessageCacheFetch, email::MessageCacheAccess, mailbox::MailboxCacheAccess},
-    mailbox::{INBOX_ID, JUNK_ID, SENT_ID, UidMailbox},
+    mailbox::{INBOX_ID, JUNK_ID, SENT_ID, TRASH_ID, UidMailbox},
     message::{
         crypto::EncryptionParams,
         index::{IndexMessage, extractors::VisitText},
@@ -446,7 +446,9 @@ impl EmailIngest for Server {
                 if params.keywords.contains(&Keyword::Junk) {
                     train_spam = Some(true);
                 } else if params.keywords.contains(&Keyword::NotJunk) {
+                    if !params.mailbox_ids.contains(&TRASH_ID) {
                         train_spam = Some(false);
+                    }
                 } else if params.mailbox_ids[0] == JUNK_ID {
                     train_spam = Some(true);
                 } else if params.mailbox_ids[0] == INBOX_ID {

crates/imap/src/op/store.rs

@@ -12,7 +12,10 @@ use crate::{
 use ahash::AHashSet;
 use common::{listener::SessionStream, storage::index::ObjectIndexBuilder};
 use directory::Permission;
-use email::message::{ingest::EmailIngest, metadata::MessageData};
+use email::{
+    mailbox::TRASH_ID,
+    message::{ingest::EmailIngest, metadata::MessageData},
+};
 use imap_proto::{
     Command, ResponseCode, ResponseType, StatusResponse,
     protocol::{
@@ -250,7 +253,8 @@ impl<T: SessionStream> SessionData<T> {
                 if keyword == &Keyword::Junk {
                     train_spam = Some(true);
                     break;
-                } else if keyword == &Keyword::NotJunk {
+                } else if keyword == &Keyword::NotJunk && !data.inner.has_mailbox_id(TRASH_ID) {
+                    // Only train as ham if not in Trash (Apple likes to add NotJunk to trashed items, which would be spammy)
                     train_spam = Some(false);
                     break;
                 }
@@ -258,7 +262,9 @@ impl<T: SessionStream> SessionData<T> {
             if train_spam.is_none() {
                 for keyword in new_data.removed_keywords(data.inner) {
                     if keyword == &Keyword::Junk {
+                        if !data.inner.has_mailbox_id(TRASH_ID) {
                             train_spam = Some(false);
+                        }
                         break;
                     }
                 }

crates/store/src/backend/elastic/main.rs

@@ -10,7 +10,6 @@ use crate::{
         CalendarSearchField, ContactSearchField, EmailSearchField, SearchableField,
         TracingSearchField,
     },
-    write::SearchIndex,
 };
 use reqwest::{Error, Response, Url};
 use serde_json::{Value, json};
@@ -118,6 +117,8 @@ impl ElasticSearchStore {
 
     #[cfg(feature = "test_mode")]
     pub async fn drop_indexes(&self) -> trc::Result<()> {
+        use crate::write::SearchIndex;
+
         for index in &[
             SearchIndex::Email,
             SearchIndex::Calendar,

crates/store/src/backend/meili/main.rs

@@ -10,7 +10,6 @@ use crate::{
         CalendarSearchField, ContactSearchField, EmailSearchField, SearchableField,
         TracingSearchField,
     },
-    write::SearchIndex,
 };
 use reqwest::{Error, Response, Url};
 use serde_json::{Value, json};
@@ -148,6 +147,8 @@ impl MeiliSearchStore {
 
     #[cfg(feature = "test_mode")]
     pub async fn drop_indexes(&self) -> trc::Result<()> {
+        use crate::write::SearchIndex;
+
         for index in &[
             SearchIndex::Email,
             SearchIndex::Calendar,