Nettlebed post office has now moved from the church hall in High Street to the BP petrol station in Â Port Hill.
Mrs Bullock, 56, who lives in HighÂ Wycombe, said: “I wasn’t expecting that many people atÂ the farewell partyÂ and it just goes to show how many you support and what a post office like that means to a smaller village.
“To get everybody togetherÂ like that was amazing really. When you take on a business like that it can go horribly wrong or take off and thankfully people were really brilliant and were so supportive from day one. Christmas did become a little bit manic but people were very patient and understanding.”
Mrs Bullock said she was going to take a break before deciding whether to continue working for the Post Office.
She thanked everyone who had supported her, saying: “I’m pleased there’s still a post office facility in the village what with the uncertainty over so many in the area.”
Barbara Lewis, chairwoman of Nettlebed Parish Council, said she was very sad to see Mrs Bullock leave.
“I was very grateful to her as chairwoman of the parish council because we have had a lot of negotiation with the Post Office and Oxfordshire County Council highways to make sure the access is safe,” she said.
“She wanted to stay but it wasn’t financially viableÂ for her to do so once the subsidy had been cut so we worked together and that really was a huge help.
“She’s a very calm and sensible lady, and absolutely charming, and she gave a lot to the village.
“In my farewell speech I was keen to let everyone know how grateful we, as a parish council, are to Mel as she has been so supportive and worked alongside us to facilitate the move of the post office.”
The branch closed on February 16Â with the new one opening the following day in the Spar shop, which is open every day from 6am to 10pm, more than double the previous hours.
A marked pedestrian walkway will be provided from the pavement to the shop entrance and two of the eight marked parking bays on the garage forecourt will be designated for disabled customers.