Hello.
We have a Whmcs with almost 1000 clients and we generate the invoices for our clients at the end of each month but we have a problem with the email sending process.
We are using mailgun SMTP to send emails, since we generate the 1000 invoices for 1000 clients at the same time , mailgun SMTP or other services provider can not send 1000 emails to clients with invoices at the sometime so some our clients will receive their invoices to their emails and some will not receive anything.
We are looking for someone who can build a module or something to generate invoices at specific date but only 50 invoices or less in minute then generate the other 50 invoices in the next 5 mins etc... till it finishes generating the 1000 invoices so the mail gun will send only 50 emails in each perod.
