diff --git a/extension/js/common/api/account-servers/external-service.ts b/extension/js/common/api/account-servers/external-service.ts
index 41bd9cba62c..ec9b478c24d 100644
--- a/extension/js/common/api/account-servers/external-service.ts
+++ b/extension/js/common/api/account-servers/external-service.ts
@@ -146,9 +146,9 @@ export class ExternalService extends Api {
         JSON.stringify({
           associateReplyToken,
           from,
-          to: (recipients.to || []).map(Str.formatEmailWithOptionalName).map(Xss.stripEmojis),
-          cc: (recipients.cc || []).map(Str.formatEmailWithOptionalName).map(Xss.stripEmojis),
-          bcc: (recipients.bcc || []).map(Str.formatEmailWithOptionalName).map(Xss.stripEmojis),
+          to: (recipients.to || []).map(Str.formatEmailWithOptionalName).map(Xss.stripEmojis).map(Str.replaceAccentedChars),
+          cc: (recipients.cc || []).map(Str.formatEmailWithOptionalName).map(Xss.stripEmojis).map(Str.replaceAccentedChars),
+          bcc: (recipients.bcc || []).map(Str.formatEmailWithOptionalName).map(Xss.stripEmojis).map(Str.replaceAccentedChars),
         })
       ),
     });
diff --git a/extension/js/common/core/common.ts b/extension/js/common/core/common.ts
index 6aac74e249f..5bd479a712d 100644
--- a/extension/js/common/core/common.ts
+++ b/extension/js/common/core/common.ts
@@ -121,6 +121,13 @@ export class Str {
     return str.replace(/[.~!$%^*=?]/gi, '');
   };
 
+  public static replaceAccentedChars = (str: string) => {
+    /*
+     * hotfix for issue https://github.com/FlowCrypt/enterprise-server/issues/6264
+     */
+    return str.normalize('NFD').replace(/[\u0300-\u036f]/g, '');
+  };
+
   public static formatEmailWithOptionalName = (emailParts: EmailParts): string => {
     return Str.formatEmailWithOptionalNameEx(emailParts);
   };
@@ -281,6 +288,7 @@ export class Str {
   public static stripPgpOrGpgExtensionIfPresent = (filename: string) => {
     return filename.replace(/\.(pgp|gpg)$/i, '');
   };
+
   private static formatEmailWithOptionalNameEx = ({ email, name }: EmailParts, forceBrackets?: boolean): string => {
     if (name) {
       return `${Str.rmSpecialCharsKeepUtf(name, 'ALLOW-SOME')} <${email}>`;