Is it possible to send mail asycronously using PHP while giving live user feedback on delivery?
I have recenty written a small app for our company's intranet for sending formatted emails to customers. The interface is quite clean and only requires the input of a job number, it then builds and sends the mail. The mail, while being built, obtains a number of attachments from another server and everything is automated. The library used is PHPMailer.
Is there a way, using other technologies, possibly, but still using PHP as the main language, to show progress of the mails being sent? I have coded robust error checking to check if the mail was actually sent, etc. but i am missing a way of giving users the visual clue of actually delivering the mail to the server via a progress bar, etc.
Is this possible using PHP and something like Ajax? How would you determine the progress of the mail in transit?
I think the best option here is by estimating the time. You can test how much time some 10MB mails takes to be sent, to know the receiving speed of you SMTP server. With that information you can estimate transfer time of any email based on its size, and give your client some visual distraction based on that.