My hosting allow to send 750 emails per hour. I have about 800 subscribers. By PHP I filtered the emails addresses and group them by mail server. Is it possible to send one email to mail server with its users.
hmm it can be possible but bit tricky And Technical. you have to know about Server Environments and how to use smtp servers in php. you have to arrange bulk of smpt servers to manage them but if hosting company view it may be they can suspend your hosting on legal and policy issues. its better to make policy of your subscribe list and change your hosting to better hosting company and enjoy it.
Is it possible for you to split list into two parts? Lets say half and half and send it into two different hours. Not sure about your specific situation because you didn't say which server and which software you use to send it. Generally speaking, most smtp servers have ability to re-try and resend the message multiple times so if it didn't go thru ones, then it will re-try again for some time until it gives up. So even if it fails for an hour, if you don't send anything else it may succeed at the next hour.
Send the email to yourself. Add the users in the BCC header. (I think that's what you're asking.) Some servers will reject the email if there are too many addresses in the BCC header. Some people have their email programs set to reject email not having their address in the To header. But other than that, it should do what I think you want.
Is it feasible for you to split listing into two parts? Lets say half and half and deliver it in two different hours. Not sure about your particular scenario because you didn't state which server and which software you make use of to send it. Generally speaking, most SMTP servers have the capability to re-try and resend the message numerous times so if it didn't experience when, then it will re-try once again for time till it quits. So even if it fails for an hour, if you don't send anything else it might prosper at the next hour.