Roger Gale from the Post Office said the Communication Workers Union were making "unrealistic" pay demands considering the fact that the company is losing £37 million a year.
The union was asking for a pay increase of three and a half percent last year, and three and a quarter percent this year, which Mr Gale said was "unaffordable."
More top news
Tony Blair has said Leave campaigners are focusing on immigration "because they've lost comprehensively the debate on the economy".
NBA player Bryce Dejean-Jones has been shot dead after breaking into an apartment he believed to be his girlfriend's, according to police.
Nineteen people have been rescued from the English Channel after the inflatable boat they were in started taking on water.