SPAM: Vacation responder hack

A hacked account in gmail.com allows mechanisms to send a lot of spam to your contacts:

Hey friend,
How are you doing recently? I'd like to introduce you a very good
foreign trading online company and the website is www.ui-mall.com
It can offer you so many kinds of electronic products which you may be
in need,such as laptops...
...
Email: uimall@188.com
Hoping you can enjoy your shopping from that company !
Regards

Tux&Cia. Solution:
Set a stronger password in you account and disable the vacation responder
Settings in gmail.com
Vacation responder:TURN IT OFF!
(sends an automated reply to incoming messages. If a contact sends you several messages, this automated reply will be sent at most once every 4 days)
Learn more