What is the best way to collect mail? Transferring from an old box to a new one or pop?

Question

gmail

Mail in Yandex, in Yandex on your domain, in Google on your domain. It is necessary to collect everything in a simple gmail account. To be able to reply on behalf of my email addresses, I use smtp and there are no problems here. But how to quickly collect mail?
At first I did it through pop, but I noticed that there are some intervals for checking for new letters. Sometimes - long. It is inconvenient when the letter arrived quickly and must be read immediately.
When forwarding to gmail - does it apply spam filters?

Answer 1

Yes, they are filtered while forwarding, but mail arrives promptly, unlike collection via POP. I use forwarding.