Claims consumers are turning to ecards as a result.
Mobile ecards firm Sharpcards says its service was boosted last week by the UK postal strike.
Specifically, the company says it saw a 103% increase in visitors using its mobile app, and a 63% increase in unique buyers compared to the monthly average.
Traffic was highest last Thursday, on the first day of the national strike. Sharpcards also says that it saw an 82% spike in visitors and 64% increase in buyers during a three-day London postal strike in July.
"We've seen considerable growth over the last 12 months, but demand has truly rocketed during the strike periods," says CEO Will Walsh.
"If similar industrial action takes place over the festive season this could clearly be a major turning point for mobile greeting content in the UK."
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