I am developing a system, in which - I have a database of email addresses of a specific type of companies. There are near 10 lac addresses in this database. In this system I want to send a message to all these addresses by one click. I am using PHPMailer. I am using Yahoo SMTP for sending email. But when I send email to some numbers of addresses, it block my yahoo email account. I think, yahoo SMTP server dose not support this kind of sending email process. So, Is there any SMTP server that support this kind of sending email process?