Thank you for reading and hopefully answering soon.

I use my ISP's POP3 server. After I manually delete e-mail(s), I would like POP Peeper to recheck for new e-mails right away like PopTrayU does instead of having it to wait for the next scheduled auto check (e.g., 5 mins).mjs wrote: ↑Sun Jun 20, 2021 12:20 pm Please provide us with more details to your question (deleting emails has no impact on the procedures POP Peeper uses to check for new messages).
Just covering the basics on ways POP Peeper can be setup to automatically retrieve messages:
As long as POP Peeper's "Mail Check" function is not disabled - POP Peeper will continue to do scheduled "Mail Checks" for new messages based on how you have the Mail Check "Polling Interval" value set at (keep in mind that "Polling Intervals" can also be set for individual accounts as well as for all accounts at the same time). However there is more to when Email accounts can be get checked for new messages of which includes how your accounts are setup in POP Peeper. For example if your Email Accounts in POP Peeper are setup to use the IMAP protocol for messages and you enable the IDLE/push function for the respective account then new messages will be retrieved by POP Peeper when available that is as of the time they reach the Email Accounts server. So there's a lot more to say regarding the various ways that POP Peeper will check for new messages than just the Mail Check feature that can do scheduled "Mail Check" automatically for new messages assuming what you mean by "autocheck" is the "Mail Check" function of POP Peeper. So more details on what it is your asking would be helpful.
(comment above edited to highlight point of reference)
I use POP3 because I keep all my e-mails on my local computer. I don't keep them on the e-mail server.
I don't see this mentioned before in this thread, but there is a "delete mail immediately" option, which people may find beneficial:In the absence of a check-after-delete feature
The v3-style GUI had this option. You can bring it back if you want:Well it would be helpful (better "usability") to have a feature (and menu item and button) for "Check only the currently selected account" that is selected in the View dropdown.