Mail.domain.com

A classic!

mail.domain.com is a common subdomain used for email services, typically hosted on a mail server or a mail relay. Here's what it usually means:

• mail: This is the subdomain that indicates the email service is hosted on this domain.
• domain.com: This is the main domain name, which is the top-level domain (TLD) of the organization or entity.

When you see mail.domain.com, it usually means that the email service is hosted on a mail server or a mail relay, and the domain name is domain.com. This subdomain is often used to access the email service, such as:

• Webmail: mail.domain.com might be used to access the web-based email interface.
• Email clients: Email clients like Microsoft Outlook, Mozilla Thunderbird, or Apple Mail might use mail.domain.com as the outgoing mail server (SMTP) or incoming mail server (POP3/IMAP).
• Mail relays: mail.domain.com might be used as a mail relay, which is a server that forwards email messages between different email servers.

In summary, mail.domain.com is a common subdomain used for email services, indicating that the email service is hosted on a mail server or mail relay, and the domain name is domain.com.