WASHINGTON — In lackluster economic times, not even postal workers enjoy much of a security envelope.

Faced with losses that could near $1.5 billion this year, the U.S. Postal Service is offering early retirement — without incentives or bonuses — to thousands of clerks, mail handlers and supervisors.

The push to cut costs involves retirement offers to workers 50 and older who have 20 years of service and employees of any age who have 25 years of service. The agency began the fiscal year last Oct. 1 with 684,762 career employees, down from 696,138 a year earlier.

Anthony Vegliante, the Postal Service's vice president for human resources, said Wednesday that as many as 130,000 workers may be eligible for the offers, some of which are already in the mail. He declined, however, to predict how many would accept them.

"It's not about meeting a magic number," Vegliante said in a telephone interview. He said the strategy is more directed toward future growth, focusing on efficiency and taking advantage of new technologies and automation.

"Because of the economy," Vegliante said, "we are continuously looking at right-sizing the organization."

Vegliante said there has been a lot of interest in the possibility of early retirement in an organization that has been undergoing many changes in recent years. A lot of things are going to be done differently in the future and some people may feel that they are at the point where they don't want to deal with those new challenges, he added.

The retirement offers, approved by the federal Office of Personnel Management, also can be extended to headquarters personnel.

Besides reducing staff, the Postal Service is seeking to consolidate or close mail handling facilities because of declining mail volume. The agency earlier had proposed having a private company operate its bulk mail centers across the country.

The volume of First Class mail, the top income source, declined by more than 3 billion items in the first nine months of this fiscal year as both individuals and businesses continued to turn increasingly to electronic communications. Other mail categories were also down.