Currently in the game it's possible to /ignore people in the chat easily: one just has to right-click on the name in the chat and select Ignore, and that's it.
However that is
not the case with the mail system, where the process is a bit more time-consuming: first off, you cannot just click on the sender's account name to get a quick list of options like you can with the chat, and there's no "Ignore Player" command at the bottom (only Delete and Report), so to actually block that account from sending any more spam mail one has to write the account name down in the chat, copy the text there and then go to the Contact screen, select the Ignore tab and then manually add the account to the ignored list there.
(image taken after I reported&ignored&deleted multiple spam mails already)

The ideal thing would be to not have spambots in the game in the first place, but I realize that it might not be an easy task to accomplish; but you could
streamline the way a player can block these accounts and report them.
Edited by Savinder on April 8, 2014 12:07PM