On Wednesday, Mr Tobin celebrated the 40-year milestone as Narromine's longest serving postal clerk.

"I can't believe how quickly the time has gone by. It does only seem like yesterday and I can remember parts of my first day very clearly," Mr Tobin said.

"I also remember leading up to starting, my dad saying it would be a job for life. He's not here to see it, but he is going to be proved correct."

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Mr Tobin began his journey with Australia post straight out of high school as a postal clerk, training for six months at the Postal Training Centre at Strathfield.

Early on he travelled around providing relief duties at post offices along the northern beaches from Spit Junction and Mosman all the way up the Pittwater and as far as Newport Beach and Avalon Beach.

During Christmas in 1982 Mr Tobin moved to Nyngan as the relief postal clerk, and took on a number of relief jobs throughout the NSW western region from Menindee near Broken Hill to Wee Waa in the north.

In 1986 Mr Tobin became the counter supervisor at Coonamble, before moving to Parkes in 1989.

He became the postal manager at Binnaway in 1992 before permanently moving to Narromine as the postal manager in February 1995.

He said there was no pathway from school to a lifetime career in the postal service like there was 40 years ago, and he considers himself "so fortunate" to have been part of the era to participate in the training program.

But it's been travelling around outback NSW during the 1980s, that was one of Mr Tobin's biggest highlights.

"I've got lots of memories starting with the 10 hour drive from Yeoval to Menindee in the 40 degree summer heat during the 1983 drought," he said.

"There was the time I answered an SOS to go to Collarenebri for a month during a Barwon River flood.

"My car was transported through flood waters cutting the Gwydir Highway on a tilt tray to get into Collarenebri, and two hours later the outgoing postal manager left town exactly the same way."

The long-serving postal manager praised his staff and the customers for making his 40 years so memorable.

"I have the best team, Brodie, Karen and Toni are so great to work with," Mr Tobin said.

"Being only two of us here at the same time we are a partnership not a team. As Manager you can't be too precious about the role - I have to do half the work.

"I think the community trust our expertise and advice, and appreciate what we do for them.

"I couldn't live being stuck in my office all day at my age, I need to talk to people, and every customer has something different to say."

For Mr Tobin the biggest change in the mail room had been technology and the transition from a completely manual system to a fully automated one.

"As the frontline for customers, we really do appreciate recent improvements to tracking of barcoded items travelling through the mail network," he said.

"It has taken much of the guesswork out of providing them with information that is important to them, such as where in Australia the parcel actually is."

Australia Post area manager for NSW rural west Tim Lennon said Mr Tobin's service and commitment at Narromine was very much appreciated by the local community.

"40 years is an incredible milestone and we're so lucky to have had Brian working with us for such a long time," he said.

"He's the longest service postal manager in the history of the Narromine post office."