Many modern email programs have "Defer or Snooze options. E.g. "Defer this email until the beginning of the next month".
Unfortunately, there is little standardization about such defer/snooze. Apps that access the same email store often seem to be doing defer/snooze in different, incompatible, ways. E.g. iPhone Mail app or MS iPhone app or Win10 Mail app or Win10/Office365 Outlook, all accessing the same Exchange server. E.g. many phone apps accessing Gmail via IMAP; whereas Gmail itself seems to have just added defer/snooze support. Some apps use folders like Defer/Next-Month, some Defer/Date-and-Time, some use tags or categories rather than folders.
So: you might look at your email programs defer/snooze options, but I would only do so if you only use a single email program. Best if only on a single platform, although Gmail on web versus as a phone app seem compatible. Microsoft's different email programs seem not to be compatible with each other.
Another gotcha: some email programs put the deferred email into folders (or Gmail labels) so that you can search like regular email. Others seem to hide the deferred email. This can make reviews hard.
Myself, although I am interested in such deferred email mechanisms, I have given up on trying to make them my primary way of doing my Tickler files. I think I am falling back to just using tickler files implemented in some way in my ordinary capture system - currently OneNote, although I am exploring (hencfe participating in this forum).
Plus: such email based defer/snooze only works semi-well for email. Awkward for stuff that you have captured that is not email. I have played around with transcribing all of my "stuff" to email, I have given up on that.