The following email and variants has been circulating:

Attention!

On October 30, 2009 server upgrade will take place. Due to this the system may be offline for approximately half an hour.
The changes will concern security, reliability and performance of mail service and the system as a whole.
For compatibility of your browsers and mail clients with upgraded server software you should run SSl certificates update procedure.
This procedure is quite simple. All you have to do is just to click the link provided, to save the patch file and then to run it from your computer location. That's all.

{a link}

Thank you in advance for your attention to this matter and sorry for possible inconveniences.

System Administrator

Please do NOT follow those instructions.  That link will infect your computer.

For those wanting that link for analysis please email us on the contact us page.  We are currently researching this issue.