Updated FAQ

FAQ.md

@@ -2564,7 +2564,7 @@ FairEmail will wait 8, 16 and 32 seconds while keeping the device awake (=use ba
 If this fails, FairEmail will schedule an alarm to retry after 15, 30 and 60 minutes and let the device sleep (=no battery usage).
 
 Between connectivity changes there is a wait of 90 seconds to give the email server the opportunity to discover the old connection is broken.
-This is necessary because the internet connection of a mobile device is often lost abruptly and will prevent the problem described in [this FAQ](#user-content-faq23).
+This is necessary because the internet connection of a mobile device is often lost abruptly and to prevent the problem described in [this FAQ](#user-content-faq23).
 
 Note that [Android doze mode](https://developer.android.com/training/monitoring-device-state/doze-standby)
 does not allow to wake the device earlier than after 15 minutes.
@@ -2576,6 +2576,9 @@ Sending messages will be retried on connectivity changes only
 to prevent the email server from blocking the connection permanently.
 You can pull down the outbox to retry manually.
 
+Note that sending will not be retried in case of authentication problems and when the server rejected the message.
+In this case you can open/expand the message and use the undo icon to move the message to the drafts folder, possible change it and send it again.
+
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