Keep a safe list of servers
Also, many users set up aMule to automatically add servers into its list under some circumstances, since the wrong belief that "the more servers in the list, the better" is very extended.
This article pretends to guide on how to avoid this.
Follow this steps in this exact order:
Go to Preferences -> Servers and disable the "Update serverlist when connecting to a server" and "Update server list when a client connect" options.
Make sure you have a good list of servers: Start by removing all the servers in your server list. If you are absolutely sure that none of the servers you have in your server list is a fake server, you may keep that list.
Then download a valid server.met file. aMule's default configuration proposes http://www.gruk.org/server.met.gz as it is a very well known and verified list of valid servers. That should be fine. To add that list to your aMule, just put it on the Networks -> eD2k top text bar and click the "blue play button" by that bar (see this article for more details).
Note: The above step will not remove the servers you already had in your server list, but simply add the servers in the downloaded list.
Now you will have a list of valid non-fake servers.
If you want to be up to date with the servers, in Preferences -> Servers, enable the option "Autoupdate serverlist at startup", then click the "list" button and add the url you used above.
If for some reason you someday find out you have no servers in the server list, just clikc the "blue play button" again to get the latest list of known good servers.
You may want to take a look at this article to discover other tricks about maintaining safe server lists.