Eagle is fine, I believe some of them have an Eagle rules file for download. Most manufacturers want Gerber files, one file per layer, but some will take native altium, orcad or eagle files. If you want to exactly define where you want solder resist, routing, etc, you are safer to use Gerbers.
Message
Re: [Homebrew_PCBs] Finished boards
2016-03-01 by richard@...