MailboxManagerMailboxManager 
The latest version of MailboxManager is 2.4 on Mac Informer. It is a perfect match for E-mail in the Communication category.
Manage one or multiple POP3 Mailboxes remotely in a single tap. This secure remote email management tool lets you inspect, delete, forward, or redirect messages before downloading them, giving you full control over your inbox.
Use scheduled mail-checking to automate tasks while the app runs quietly in background mode. Ideal for users seeking a POP3 multi-account mailbox checker, efficient inbox cleanup, and reliable background email monitoring.