According to the email, EA has "deactivated all SimCity text links and creative and we ask you to please remove any copy promoting SimCity from your website for the time-being."
When asked to confirm, an EA rep stated, "To be clear, we are continuing to pay out commissions on all SimCity sales that are referred, however, we are requesting that you please stop actively promoting the game. We will notify you as soon as the SimCity marketing campaigns have been resumed and our promotional links are once again live in the Linkshare interface. We apologize for any inconveniences that this may cause, and we thank you for your cooperation."
The server issues plagued SimCity at launch, but after increasing servers by a factor of 120%, they have more or less vanished.