diff --git a/kmmsgbase.cpp b/kmmsgbase.cpp
index e62c3dc44..95cd8246d 100644
--- a/kmmsgbase.cpp
+++ b/kmmsgbase.cpp
@@ -464,7 +464,7 @@ QString KMMsgBase::decodeRFC2047String(const QCString& aStr)
 
 //-----------------------------------------------------------------------------
 const QString especials = "()<>@,;:\"/[]?.= \033";
-const QString dontQuote = "\"()<>,";
+const QString dontQuote = "\"()<>,@";
 
 QCString KMMsgBase::encodeRFC2047Quoted(const QCString& aStr, bool base64)
 {