The cards and gifting business used the service for Father’s Day last month, with 60,000 gifts delivered via Royal Mail’s Tracked 24 parcels service. 

Moonpig said it planned to make cards part of the regular Sunday delivery offering, again via Tracked 24, “in the near future”.

Shipping director Tony Bannister said: “This was a significant milestone to allow our customers to send cards and gifts for the first time that arrived on Father’s Day itself, making the day even more special for Dads.” 

He said Moonpig’s “intelligent operations network” enabled the business to offer the latest cut off times in the market for next day delivery of personalized cards and gifts.

Royal Mail and Moonpig have a relationship that stretches back for more than 20 years, with Royal Mail delivering for Moonpig since the business was founded in 2000. 

Nick Landon, Chief Commercial Officer at Royal Mail said: “We have been delivering for Moonpig for many years and have now extended our partnership to a seven-day service. 

“We always listen to our customers and Sunday delivery has been one of the services they have been asking for. The UK already trusts us to deliver their purchases six days a week both quickly and conveniently. Now our posties are doing the same thing seven days a week.”

Moonpig was valued at more than £1bn when it floated on the stock exchange in February. It will announce its maiden results as a PLC later this month.