New players in Japan's postal services would be obliged to set flat rates nationwide for ordinary mail of up to 250 grams after partial liberalization in 2003 under government-drafted legislation, Liberal Democratic Party officials said Tuesday.

The legislation would require private firms to set a flat rate of up to 80 yen for mail of up to 25 grams and an unspecified flat rate for items weighing up to 250 grams, the LDP officials said.

The legislation on a proposed law on confidential correspondence would also require private firms to accept mail every day and deliver it six days a week in principle.