I want to send newsletter with cakephp.
Which plugin is good for it?
cakeresque,
CakePHP Queue Plugin,
CakePHP Email Queue plugin,
or etc ...
Without knowing any context, I'd scratch off the Queue plugin. It is pushing for minimalistic, but it doesn't sound like that is what you want. On the other end, CakeResque seems a bit overkill, and may be too much for your needs. Email Queue plugin seems simple enough to get the job done, but it hasn't been updated in two years, which could potentially cause problems if you aren't careful.
It really depends on what you like more. CakeResque is probably a safe bet, as it seems updated and you will find a lot more support than you might on the open source projects, but I prefer the last one, Email Queue plugin, as it is simple and gets it done fine.