There are different types of hosting. Usually these are:
Shared hosting (also known as “common” or “virtual”).
Virtual dedicated servers (VDS, also known as VPS).
Hardware dedicated servers.
Cloud hosting (a virtual cluster that allows for rapid expansion of computing resources on demand).
When you rent shared hosting, you usually get all the necessary tools on a turnkey basis, including a control panel with a pre-installed web client for mail on your domain. There are also certain customization options: autoresponders, antispam, redirection, etc.
The main disadvantage of this approach is weak server resources. Mailboxes will take up the already limited disk space. And you will not be able to choose a mail client or fine-tune it for yourself. These are exclusively standard configurations.
If you rent your own server (virtual or dedicated), you can set up any software you want, paid or free. But since the hoster owns the IP addresses, it does not need spam bans. Therefore, almost all virtual nigeria phone number data and dedicated servers have blocked ports required for working with mail (25 and 465 for outgoing connections). In order to be able to send mailings, you will need to prove their legitimacy and security.
Some hosters provide webmail services separately. Then you get access to a ready-made infrastructure and a mail client regardless of the type of hosting you choose.
The benefits of running corporate mail on your own hosting
You have maximum control over the technical parameters of the mail service: what forwarding rules are used, how spam is filtered, where unsent letters go, etc.
Customer data (all correspondence) is also under your control. You can save a backup copy of letters or transfer them to another mail hosting.
You gain independence from the infrastructure of large providers (Gmail, Yandex Mail, Mail.ru, etc.).
You are provided with adequate interfaces with simple and clear settings. Typical solutions are usually used to organize the service: hMailServer, Exim, iRedMail. Dovecot, RoundCube (supplied with the popular Russian ISPmanager panel), Zimbra Collaboration, Mailpile, etc. Instead of a web interface, you can use a classic mail client (Mozilla Thunderbird, The Bat, etc.).
You can create your own analogue of Gmail or Yandex.Mail. For example, large corporate clients can get this opportunity together with the Mailon solution from the developers of MyOffice (the software is initially designed for microservice architecture and can scale to any load).