Ouch. Here’s a story of a contractor who sent in a bid to an RFP via email (as required), but spam filters trapped his messages, costing him the project. He says the project is worth $670k, and he could have saved the city $250k had he won. The IT group in the article mentioned the term "long distance" being the reason it was blocked.
I’ve never heard of "long distance" being considered spammy, but I wouldn’t be surprised. This is probably the 5th time I’ve linked to this page, but it’s worth re-visiting periodically: Spam Assassin Scoring Criteria.
It lists all the different phrases and "clues" that one of the most popular spam filters searches for within emails.