Portsmouth, who was previously managing director of mailing house 4DM, takes charge of the company's operational, manufacturing and managed services divisions.
Despite a move from 280-staff 4DM, where Portsmouth served for 17 years, he said that Inc Direct represented a "fantastic challenge" in a more marketing-based environment.
"The mass mailing market is struggling and differentiating your business is tough in this climate. Inc Direct is more of a solutions sell and I look forward to understanding more about the business," he said.
Noel Warner, managing director of Inc Direct, added that the appointment was "an extremely significant and strategic placement within our business".
He said: "We’ve made huge investment in digital firepower to gear our business to deliver turnover in excess of £10m by the end of our next financial year and James not only has the pedigree but experience and knowledge to help us achieve this.
"I’m absolutely delighted that James has decided to join Inc Direct despite some other serious offers he had on the table."
Have your say in the Printweek Poll
Related stories
Latest comments
"And here's me thinking they bought the Docklands Light Railway."
"15 x members? Why don't they throw their lot in with the Strategic Mailing Partnership (SMP) and get a louder voice?"
"Some forty plus years ago I was at a "sales" training seminar and got chatting to the trainer after the session had finished.
In that conversation he told me about another seminar he had..."
Up next...

Customer demand increasing
A4 Laser Labels expands with larger site and kit investment

Price rises in US 'to at least partially offset' costs
Cimpress withdraws guidance due to Trump's tariffs

Proceeds to be invested in growth strategy
James Cropper sells some specialist IP

Making changes to limit tariff impact in US