Online gift and greeting card retailer FunkyPigeon.com has stopped taking new orders following a cyber attack last week.
The company is writing to all customers from the past year to tell them about it, but the business doesn't believe any customer data was obtained by the hackers.
The firm, which has a base in St Peter Port at the old Guernsey Post office, has taken its systems offline "as a precaution".
Its parent company, WHSmith, said in a statement that FunkyPigeon.com customer data is taken extremely seriously:
"The company has temporarily suspended orders from the website and is currently investigating the detail of the incident with external IT specialists.
No customer payment data, such as bank account or credit card details, has been placed at risk - all of this data is processed securely via accredited third parties and is securely encrypted.
We are currently investigating the extent to which any personal data, specifically names, addresses, e-mail addresses and personalised card and gift designs have been accessed."

Deputies asked to approve £6m Guernsey Airport roof repairs
Guernsey Budget 2027: £15m growth fund and fuel duty hikes
Majority of Guernsey stamps bought by collectors
Alex Scott withdraws from England squad
GST backlash prompts call for calm from Guernsey deputy
Deputies vote in GST at 3% as part of tax reform package
Man charged with murder of Hannah Benfield in Alderney
Deputy Inder apologises for raising middle finger to GST protestors