What are the advantages of paid mail services over your own?

Question

Email

There was a need to send a large number of letters. Previously, mailing was via Yandex smtp, but recently it began to block sending due to the large volume.
Now there are two options: set up your mail server or use paid services.
Explain, please, than paid services are better? I read on the Toaster that even if everything is set up correctly on my own, all the same, letters will end up in spam. Why?

Answer 1

Because there are whitelists of trusted mail servers.
PS Large companies can exchange them, and you can only get into them through the bed (but this is not accurate)

Answer 2

either you do everything yourself
or you just pay and use that's all the differences

Answer 3

I use yahoo and gmail. There is no blocking of outgoing emails due to spam. Both services are free. But there is also a paid version. There are mobile apps. There are temporary addresses if you are afraid that the site where you register will send spam.

Answer 4

Letters can end up in spam anyway, no matter what server you send it from. For example, because the admin has a bad mood in the morning. There are no criteria for evaluating spam - and everyone, as he wants, is perverted.

Answer 5

1. You need your own server.
2. Providers either do not give access to the 25th port at all, or set severe restrictions.