diff --git a/config/settings.yml b/config/settings.yml
index 05990af2e..6f4368343 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -19,7 +19,7 @@ mail-from:
   name:         "_env:MAILFROM_NAME:Uni2work"
   email:        "_env:MAILFROM_EMAIL:uniworx@localhost"
 mail-object-domain: "_env:MAILOBJECT_DOMAIN:localhost"
-mail-sender-fixed: "_env:MAILSENDER_FIXED:True"
+mail-use-replyto-instead-sender: "_env:MAIL_USES_REPLYTO:true"
 #mail-verp:
 #  separator:    "_env:VERP_SEPARATOR:+"
 #  prefix:       "_env:VERP_PREFIX:bounce"
diff --git a/src/Foundation/Instances.hs b/src/Foundation/Instances.hs
index 67e1b501b..1bb5da169 100644
--- a/src/Foundation/Instances.hs
+++ b/src/Foundation/Instances.hs
@@ -177,7 +177,7 @@ instance YesodMail UniWorX where
   defaultFromAddress  = getsYesod $ view _appMailFrom
   envelopeFromAddress = getsYesod $ view _appMailEnvelopeFrom
   mailObjectIdDomain  = getsYesod $ view _appMailObjectDomain
-  fixedSenderInDomain = getsYesod $ view _appMailFixedDomainSender
+  useReplyToInstead   = getsYesod $ view _appMailUseReplyToInstead
   mailDateTZ = return appTZ
   mailSmtp act = do
     pool <- maybe (throwM MailNotAvailable) return =<< getsYesod appSmtpPool
diff --git a/src/Mail.hs b/src/Mail.hs
index 6a53571e2..97c516308 100644
--- a/src/Mail.hs
+++ b/src/Mail.hs
@@ -257,8 +257,8 @@ class Yesod site => YesodMail site where
   mailObjectIdDomain = pack <$> liftIO getHostName
 
   -- | Use replyTo instead for all senders within mailObjectIdDomain
-  fixedSenderInDomain :: (MonadHandler m, HandlerSite m ~ site) => m Bool
-  fixedSenderInDomain = return False
+  useReplyToInstead :: (MonadHandler m, HandlerSite m ~ site) => m Bool
+  useReplyToInstead = return True -- not changeing the sender is the save choice
 
   mailDateTZ :: (MonadHandler m, HandlerSite m ~ site) => m TZ
   mailDateTZ = return utcTZ
@@ -316,7 +316,7 @@ defMailT ls (MailT mailC) = do
   (ret, mail, smtpData) <- runRWST mailC ls (emptyMail fromAddress)  
   
   mail' <- maybeT (return mail) $ do
-    guardM fixedSenderInDomain -- if sender must be fixed within ObjectIdDomain, use replyTo instead
+    guardM useReplyToInstead -- if sender must be fixed within ObjectIdDomain, use replyTo instead
     let sender = mail ^. _mailFrom 
     domain <- lift mailObjectIdDomain
     guard $ domain `Text.isSuffixOf` (sender ^. _addressEmail) -- allowing foreign senders might be Fraport specific; maybe remove this guard
diff --git a/src/Settings.hs b/src/Settings.hs
index 67676bb55..84d910a5a 100644
--- a/src/Settings.hs
+++ b/src/Settings.hs
@@ -126,7 +126,7 @@ data AppSettings = AppSettings
     , appMailFrom
     , appMailSender    
     , appMailSupport            :: Address
-    , appMailFixedDomainSender  :: Bool
+    , appMailUseReplyToInstead  :: Bool
     , appJobWorkers             :: Natural
     , appJobFlushInterval       :: Maybe NominalDiffTime
     , appJobCronInterval        :: Maybe NominalDiffTime
@@ -558,7 +558,7 @@ instance FromJSON AppSettings where
         appMailEnvelopeFrom       <- o .:? "mail-envelope-from" .!= addressEmail appMailFrom
         appMailSender             <- o .:? "mail-sender" .!= appMailFrom
         appMailObjectDomain       <- o .: "mail-object-domain"
-        appMailFixedDomainSender  <- o .: "mail-sender-fixed" .!= True
+        appMailUseReplyToInstead  <- o .: "mail-use-replyto-instead-sender" .!= True
         
         appMailVerp               <- fromMaybe VerpNone . join <$> (o .:? "mail-verp" <|> pure Nothing)
         appMailRetainSent         <- o .: "mail-retain-sent"