Updated FAQ

FAQ.md

@@ -106,7 +106,7 @@ FairEmail follows all the best practices for an email client as decribed in [thi
 * [(19) Why are the pro features so expensive?](#user-content-faq19)
 * [(20) Can I get a refund?](#user-content-faq20)
 * [(21) How do I enable the notification light?](#user-content-faq21)
-* [(22) What do 'Couldn't connect to host', 'Connection refused', 'Network unreachable', 'Software caused connection abort', 'Connection reset by peer', 'Read timed out' and 'Broken pipe' mean?](#user-content-faq22)
+* [(22) What do 'Couldn't connect to host', 'Connection refused', 'Network unreachable', 'Software caused connection abort', 'Connection closed/reset by peer', 'Read timed out' and 'Broken pipe' mean?](#user-content-faq22)
 * [(23) Why do I get 'Too many simultaneous connections' or 'Maximum number of connections ... exceeded' ?](#user-content-faq23)
 * [(24) What is browse messages on the server?](#user-content-faq24)
 * [(25) Why can't I select/open/save an image, attachment or a file?](#user-content-faq25)
@@ -643,7 +643,7 @@ but such apps cannot be updated anymore and recent Android versions will show a
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 <a name="faq22"></a>
-**(22) What do 'Couldn't connect to host', 'Connection refused', 'Network unreachable', 'Software caused connection abort', 'Connection reset by peer', 'Read timed out' and 'Broken pipe' mean?**
+**(22) What do 'Couldn't connect to host', 'Connection refused', 'Network unreachable', 'Software caused connection abort', 'Connection closed/reset by peer', 'Read timed out' and 'Broken pipe' mean?**
 
 The messages *... Couldn't connect to host ...*, *... Connection refused ...* or *... Network unreachable ...*
 mean that FairEmail was not able to connect to the email server.
@@ -654,6 +654,9 @@ This can for example happen when connectivity was abruptly lost. A typical examp
 
 The message *... Connection reset by peer ...* or *... Broken pipe ...* means that the email server actively terminated an existing connection.
 
+The message *... Connection closed by peer ...* might be caused by a not updated Exchange server,
+see [here](https://blogs.technet.microsoft.com/pki/2010/09/30/sha2-and-windows/) for more information.
+
 The message *... Read timed out ...* means that the email server is not responding anymore or that the internet connection is bad.
 
 See [here](https://linux.die.net/man/3/connect) for what error codes like EHOSTUNREACH and ETIMEDOUT mean.