Added FAQ

FAQ.md

@@ -272,6 +272,7 @@ FairEmail follows all the best practices for an email client as described in [th
 * [(140) Why does the message text contain strange characters?](#user-content-faq140)
 * [(141) How can I fix 'A drafts folder is required to send messages'?](#user-content-faq141)
 * [(142) How can I store sent messages in the inbox?](#user-content-faq142)
+* [(143) Can you add a trash folder for POP3 accounts?](#user-content-faq143)
 
 [I have another question.](#user-content-support)
 
@@ -2651,6 +2652,17 @@ If this is not an option, you can [create a rule](#user-content-faq71) to automa
 
 <br />
 
+<a name="faq143"></a>
+**(143) Can you add a trash folder for POP3 accounts?**
+
+[POP3](https://en.wikipedia.org/wiki/Post_Office_Protocol) is a very limited protocol.
+Basically only messages can be downloaded and deleted from the inbox.
+It is not even possible to mark a message read.
+
+Since POP3 does not allow access to the trash folder at all, there is no way to restore trashed messages.
+
+<br />
+
 ## Support
 
 Requested features should: