Updated FAQ

FAQ.md

@@ -803,11 +803,15 @@ see [here](https://blogs.technet.microsoft.com/pki/2010/09/30/sha2-and-windows/)
 
 The error *... Read timed out ...* means that the email server is not responding anymore or that the internet connection is bad.
 
-The error *... Unexpected end of zlib input stream ...*" means that not all data was received, possibly due to a bad or interrupted connection.
+The error *... Unexpected end of zlib input stream ...* means that not all data was received, possibly due to a bad or interrupted connection.
 
 The warning *... Unsupported encoding ...* means that the character set of the message is unknown or not supported.
 FairEmail will assume ISO-8859-1 (Latin1), which will in most cases result in showing the message correctly.
 
+Please [see here](#user-content-faq4) for the error *... Invalid security certificate (Can't verify identity of server) ...*.
+
+Please [see here](#user-content-faq127) for the error *... Syntactically invalid HELO argument(s) ...*.
+
 See [here](https://linux.die.net/man/3/connect) for what error codes like EHOSTUNREACH and ETIMEDOUT mean.
 
 Possible causes are:
@@ -2395,7 +2399,8 @@ It is a good idea to review the connection setting *Automatically download messa
 <a name="faq127"></a>
 **(127) How can I fix 'Syntactically invalid HELO argument(s)'?**
 
-You can likely fix the error *Syntactically invalid HELO argument(s)* by disabling the advanced indentity option *Use local IP address instead of host name*.
+The error *... Syntactically invalid HELO argument(s) ...* means that the SMTP server rejected the local IP address or host name.
+You can likely fix this error by enabling or disabling the advanced indentity option *Use local IP address instead of host name*.
 
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