How to know the mail server

There are a few ways to determine the mail server for a domain:

1. MX Record Lookup: You can use a DNS lookup tool or a website like MXToolbox or WhatIsMyMXRecord to look up the MX records for a domain. MX records point to the mail server responsible for receiving email for a domain.
2. Email Client Configuration: If you're setting up an email client like Outlook or Thunderbird, you can usually find the mail server information in the client's settings or configuration file.
3. Domain Registrar or Web Host: If you're hosting your domain with a registrar or web host, you can contact their support team to ask for the mail server information.
4. WHOIS Lookup: You can perform a WHOIS lookup on the domain to find the contact information for the domain owner, which may include the mail server information.
5. Email Header Analysis: If you receive an email from a domain, you can analyze the email headers to find the mail server information. The "Received" headers will typically list the mail servers that handled the email.

Here are some common mail server types:

• SMTP Server: Responsible for sending email.
• POP3 Server: Responsible for retrieving email from a mail client.
• IMAP Server: Responsible for retrieving email from a mail client, similar to POP3.
• Mail Transfer Agent (MTA): Responsible for routing email between mail servers.

Some common mail server protocols:

• SMTP (Simple Mail Transfer Protocol): Used for sending email.
• POP3 (Post Office Protocol version 3): Used for retrieving email from a mail client.
• IMAP (Internet Message Access Protocol): Used for retrieving email from a mail client.
• ESMTP (Extended SMTP): An extension of the SMTP protocol used for sending email.

Keep in mind that mail server information may be private or confidential, and you may need permission from the domain owner or administrator to access this information.