Which mail server is reliable and fast?

Mail servers today can be used not only for sending personal messages, but also for sending mass mailings, setting up auto-replies, creating shared folders and a unified address system. And I understand you when you talk about the reliability and speed of servers. I have been looking for a server for e-mail for several months, just like you. I have studied many different proposals. And now I can confidently recommend you renting servers at Introserv company . They have solutions at super prices! On the company's website, you can pre-calculate the cost of the server depending on the amount of memory, location, and other parameters.