Tens of thousands of Londoners are going to lose their door-to-door mail delivery.

But a group of concerned citizens, led by London-Fanshawe MP Irene Mathyssen is aiming to stop that.

On Saturday, they braved the weather, going to door-to-door to tell residents what they believe is at stake.

Over a year ago, Canada Post announced it would put an end to home delivery, citing rising costs and falling mail volume.

In London, about 40,000 are expected to lose the service starting this year as community mailboxes are installed to save money.

Matthysen says it's a mistake.

"We know that Canada Post is profitable. We know that last year alone they made $17 million and there are all sorts of opportunities to continue that level of productivity," says Mathyssen.

Matthysen and a group of volunteers are spreading the word, gathering signatures for petitions and trying to stop what seems like an inevitably.

"We're also looking out for the people with disabilities, for our seniors, who will be unable to get their mail," says activist Lisa Long.

The Canadian Union of Postal Employees doesn't want to lose up to 100 jobs in London and more nation-wide.

Although cities will ultimately bear much of the cost for the community mailboxes, there's very little they can do to actually stop their implementation.

London city council for example has asked staff to ask Canada Post to hold more public consultations, but the city of Montreal has gone a step further.

Its mayor is asking for a moratorium on the mailboxes.