Let's say I like to target different niches for my business. Perhaps it's restaurateurs, real estate agents and chriopractors. Is it better to have a mailing list for each or just attempt to get them to all join the same list?
It would seem unwieldy to manage a list for every segment of my business, but on the other hand it would also better allow the message to be customized for each segment.
What are your thoughts on this?