Royal Mail staff in Derry are returning to work today following a statement from the UDA insisting it did not threaten a Catholic postman.
Postal workers in the city had gone on strike yesterday following a telephone threat against their colleague.
A caller to the Samaritans on Sunday night named a Catholic postman and warned him not to enter the mainly Protestant Waterside area of the city. The threat was not made in the name of a paramilitary group and did not carry any code word.
It followed the loyalist murder of Catholic postman, Daniel McColgan, in north Belfast three weeks ago.
The postal workers in Derry agreed to return to work after the Communication Workers Union was told at a meeting with Royal Mail management they had been assured the threat was not from loyalist paramilitaries.
The UDA statement was read to a mass meeting of postal workers. CWU Branch Secretary, Mr Billy Hannaway, said his members were returning to work but still had concerns.
"There had to be something to this threat because the caller named the individual and exactly where he delivered to." Some other postmen had now said they did not want to enter the Waterside, he added.
A Royal Mail spokesman said: "We do take the safety and security of our people very seriously and have special measures in place to deal with anonymous threats to individuals as received on this occasion.
"We have received confirmation from paramilitary sources that there is no threat to postal workers and our employees have accepted this."
Meanwhile, loyalist sources have said that elements of the UDA could join forces with the LVF to form a new paramilitary group.
The new organisation would include members of the UDA's Shankill Road C company, formerly led by Johnny Adair. The UDA has been recruiting heavily in recent months, particularly among teenagers.
Senior loyalist sources said they believe a major realignment within loyalism will happen over coming months.
They said there was increasing opposition to the Belfast Agreement within their community.
The sources said there was no major discontent within the UVF. The UVF leadership, which continues to support the agreement, remained firmly in control of that organisation, they added.