Also asked this in the NL forum (but it's not as active as English/.com, so I have more chance on an explanation here). Anyways:
Today, different types of mails have been sent by Travian.
Some people received this mail:
And others, including myself, received this mail:
So why do some people receive free 300 gold and others only ads? It feels to me like a unfair disadvantage (as I probably have to pay more silver for items etc.)