diff --git a/src/servers/api/email/email-db.ts b/src/servers/api/email/email-db.ts
index bbc09252..d6e3b872 100644
--- a/src/servers/api/email/email-db.ts
+++ b/src/servers/api/email/email-db.ts
@@ -354,7 +354,12 @@ function normalizeCharset(charset: string): string {
   const map: Record<string, string> = {
     'iso-8859-1': 'latin1',
     'iso_8859-1': 'latin1',
+    'iso-8859-15': 'latin1',
+    'iso_8859-15': 'latin1',
+    'windows-1250': 'latin1',
+    'windows-1251': 'latin1',
     'windows-1252': 'latin1',
+    'windows-1254': 'latin1',
     'us-ascii': 'ascii',
     'ascii': 'ascii',
   };