I signed up for the Woolworths new email alerts and they sent me a $10 off voucher, it took about 24 hours for them to send it but they're supposedly individual for each user.

you can register for the Woolworths email alerts here and hopefully they'll send you a coupon too:

Dealdude, to get you started with online shopping we're offering you $10 off
Enter code My Coupon at checkout when you spend $150 or more. Hurry, offer ends 14 October 2014.
Wonder White Bread Varieties 700g Western Star Spreadable 500g
The small print at the bottom
Never miss a great special.
Just add shoponline@woolworths.com.au and newsletters@online.woolworths.com.au to your safe senders list.

The offers in this email are available for orders placed from Wednesday 8th October 2014 until Midnight AEDT Tuesday 14th October 2014 and are online at http://www2.woolworthsonline.com.au/ whilst stocks last and may differ from specials available in stores. Limited quantities may apply.

Things to note about Woolworths Flowers Offer:
Same day free delivery applies to all orders made by 1pm, Monday to Friday.
Delivery excludes ACT, NT and TAS.
Only available at www.woolworthsflowers.com.au.
Standard Woolworths Flowers terms apply.

Things to note about your $10 OFF offer:
Offer only applies to email address removed.
Enter code My Coupon when you spend $150 or more.
Minimum spend of $150 excludes any other coupons and/or discounts. $150 or more must be spent in a single transaction.
Offer valid for orders placed from 00:01 AEDT 08/10/2014 to 23:59 AEDT 14/10/2014.
Offer valid only once per shopper during the offer period.
Order cannot be used in conjunction with any other offer.
Orders may be cancelled by us without notice to you if the above terms and conditions are not adhered to.
Excludes tobacco, Gift cards and Gift idea items.
Offer can be redeemed at woolworthsonline.com.au only.

You are receiving this email because you previously indicated your preference to accept Woolworths shop online emails with the email.

We wish to remind you that you are not permitted to purchase any items for resale to a third party or for trade purposes. We reserve the right to accept or reject your order for any reason, including if the requested product is not available. Please see our Terms & Conditions for details.