CHALLENGEIt was a massive case of the cobbler’s children going barefoot. Last fall, execs from Ariad Custom Communications were sitting in the most important meeting of the year — a focus group meeting with some of their longest-term marketing clients in the financial services industry. One of Ariad’s biggest product lines is custom email newsletters. Senior VP Mark Michaud says, “Our clients posed the question, ‘If you think newsletters are such a hot way to stay in touch, why don’t you practice what you preach?’” Embarrassed silence for a moment.Then the team agreed — yes, of course, they would launch an email newsletter of their own on marketing for financial advisors. One small problem — if your…