If you are using gmail, you probably could use "Check email from other accounts:" under "Settings / Accounts and Import". It fetches new mails periodically usin

If you are using gmail, you probably could use "Check email from other accounts:" under "Settings / Accounts and Import". It fetches new mails periodically using POP3 or IMAP. If you host your own mail server, you could use https://www.fetchmail.info/fetchmail-man.html https://www.fetchmail.info/fetchmail-man.html instead.