By Ed Ballard

Royal Mail PLC (RMG.LN) warned Tuesday over intensifying competition in the parcel delivery market, but said a stronger-than-expected performance from its letters business will help it meet full-year expectations.

"Given the increasing challenges we are facing in the U.K. parcels market, our parcels revenue for the year is likely to be lower than we had anticipated," Chief Executive Moya Greene said in a statement.

"However, through cost-control measures and with continued good letters performance we expect to be able to offset the impact on profit," she added.

Overall, comparable sales for the first quarter to June 29 climbed 2% as letter delivery volumes declined slower than expected, Royal Mail said. Letters revenue rose 3% driven by price increases, beating expectations--even as volumes slipped 3%.

Shares in the company dropped after the announcement, trading 1.3% lower at 460 pence at 0741 GMT, having earlier dipped nearly 4%.

Royal Mail is facing competition from new entrants including Amazon.com Inc. (AMZN) to the parcel delivery market. Innovation from rivals such as DPD Hermes--which offers customers precise delivery times--is piling on the pressure.

The strength of the British pound is also making it more expensive to send packages overseas, the company said Tuesday.

Measures to defend its share of the parcels business--for instance by lengthening its business hours on Sundays--will start to have an impact in the second half, Royal Mail said.

Royal Mail joined the stock market last October when the government sold a majority stake in a flotation raising almost 2 billion pounds ($3.42 billion). The stock soared, provoking complaints that the 330 pence offer price was too cheap.

Shares climbed as high as 618 pence in January but have since shed around a quarter of their value amid concerns over profit margins and the sustainability of Royal Mail's obligation to deliver to every address in the U.K. for the same price.

The company complained to regulators in June that the obligation leaves it vulnerable to rivals such as TNT Express NV (TNTE.AE) which aren't obliged to deliver to remote places.

Concerns over Royal Mail's market share and an antitrust probe in France "are likely to continue to weigh on the share price in the near term," Panmure Gordon advised. The broker maintained its buy rating, saying the stock's 4.5% dividend yield underpins its allure.

Along with TNT and FedEx Corp. (FDFX), Royal Mail warned last week that losses from the French investigation could have a material impact on its business.

Write to Ed Ballard at ed.ballard@wsj.com

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