How to do send e-mail to all client's ???!!!

Dear ,

Kindly, How to do send e-mail to all client to end month about the payment the sharing and the client know the sharing end , and the client know too begin new month ..

Please help me about that , coz i need this necessary ..

Search the forums. This has been discussed dozens of times.

OKAY, I’ll search in forum about this subject , but if possible send to me steps that ..