Added FAQ

FAQ.md

@@ -140,6 +140,7 @@ FairEmail follows all the best practices for an email client as decribed in [thi
 * [(77) Why are messages sometimes shown with a small delay?](#user-content-faq77)
 * [(78) How do I use schedules?](#user-content-faq78)
 * [(79) How do I use synchronize on demand (manual)?](#user-content-faq79)
+* [(80) How can I fix 'Unable to load BODYSTRUCTURE'?](#user-content-faq80)
 
 [I have another question.](#support)
 
@@ -1301,6 +1302,16 @@ instead you can manually synchronize messages by either using pull-down-to-refre
 
 <br />
 
+<a name="faq80"></a>
+**(80) How can I fix 'Unable to load BODYSTRUCTURE' ?**
+
+The error message *Unable to load BODYSTRUCTURE* is caused by bugs in the email server,
+see [here](https://javaee.github.io/javamail/FAQ#imapserverbug) for more details.
+
+FairEmail already tries to workaround these bugs, but if this fail you'll need to ask for support from your provider.
+
+<br />
+
 ## Support
 
 If you have another question, want to request a feature or report a bug, you can use [this forum](https://forum.xda-developers.com/android/apps-games/source-email-t3824168).