We want to make an application where we can filter our clients emails separately along with other components. Can we do this using SMPT. Reading through the docs there's a big emphasis on sending, but I'm not so sure if fetching is also a part that can be done as well.
SMTP servers, in general, can only be used for sending emails. If you're looking to read emails from a particular inbox you may have better luck connecting to a REST API if the mail server where you're receiving emails with has one.
Are you using a single service to receive client emails? If so, which one?