Royal Mail staff at Ipswich sorting office are set to walk-out in a row over plans to move mail processing to Chelmsford.
Seventy per cent of Communication Workers Union members balloted voted in favour of strike action.
Royal Mail plans to move operations to Chelmsford by summer 2015.
Details of the walk-out are yet to be announced.
The case of a postman from Milton Keynes who needed 100 stitches to his face after a dog attack is highlighted in a new campaign.
Royal Mail and the Communication Workers Union say 5,000 postal workers and around 400 telecom engineers are attacked by dogs every year.
They want new laws to protect people attacked on private property.
Royal Mail is to review the future of its sorting centre in Ipswich with unions fearing that jobs could be at risk.
More than 200 people are employed at the office on Commercial Road, which opened in 1986. The review findings will be known in May 2013.
The Royal Mail in East Anglia is trialling a new device to map the exact location of homes and businesses in a move which could improve satellite navigation systems in cars.
If it is successful the project will be rolled out across the whole country.
Postal workers will be mapping the GPS longitude, latitude and altitude co-ordinates of every property in East Anglia.
A letter posted in Cambridge travelled thousands of miles and took two months to get to its destination, less than one mile away. Shamim Ahmed from Mowbray Road sent a letter to Ridgefield Primary School, but when it finally arrived it had a postmark from Thailand.