how to send mail using mailchimp in php. I am using api ($url = "https://us8.api.mailchimp.com/1.0/SendEmail";) it showing "the requested URL /1.0/lists was not found on this server."
Version 1 of the mailchimp api is deprecated and they said it will stop working at the end of 2016. I recommend you look into v3 instead.
I don't know exatly what you mean by "send mail" but you can start a campaign from this endpoint (under actions)