I am working on an application (in Delphi XE8) that amongst other things allows the user to send emails. The solution I have chosen is to simply save the email as a text file with a "From:" and "To:" field in a SMTP pickup directory, which has worked fine up to now. I use a SMTP virtual server set up in IIS 6.
However, a new requirement is to be able to choose the sending time of the email. Is there some way I can specify this through the text file, or is this only possibly by changing the IIS settings? I would be very grateful for any tips that anyone may have.
Try using IMAP4 (standard protocol for service-based handling of mails and folders for a mail client) instead of SMTP. Then use an email client that supports postponing of sending messages, and use its scripting to configure message sending the way you want it.
If your program continues running till send time, you could also create a thread that waits till the time you want the message sent, but I suppose that is too simple :)