diff --git a/FAQ.md b/FAQ.md index 65b1f73737..22f1c40ba0 100644 --- a/FAQ.md +++ b/FAQ.md @@ -1002,8 +1002,15 @@ The message *... +OK ...* likely means that a POP3 port (usually port number 995 The errors *... invalid greeting ...*, *... requires valid address ...* and *... Parameter to HELO does not conform to RFC syntax ...* can likely be solved by changing the advanced identity setting *Use local IP address instead of host name*. -The errors *... Couldn't connect to host ...*, *... Connection refused ...* or *... Network unreachable ...* -mean that FairEmail was not able to connect to the email server. +The error *... Couldn't connect to host ...* means that there was no response from the email server within a reasonable time (20 seconds by default). +Mostly this indicates internet connectivity issues, possibly caused by a VPN or by a firewall app. +You can try to increase the connection timeout in the connection settings of FairEmail, for when the email server is really slow. + +The error *... Connection refused ...* means that the email server +or something between the email server and the app, like a firewall, actively refused the connection. + +The error *... Network unreachable ...* means that the email server was not reachable via the current internet connection, +for example because internet traffic is restricted to local traffic only. The error *... Host is unresolved ...* or "*... Unable to resolve host ...* means that the address of the email server could not be resolved. This might be caused by ad blocking or an unreachable or not properly working [DNS](https://en.wikipedia.org/wiki/Domain_Name_System) server.