How to know ip of mail receiver

There are a few ways to determine the IP address of a mail receiver:

  1. MX Record Lookup: You can use a DNS lookup tool to retrieve the MX record for the domain of the mail receiver. The MX record contains the IP address of the mail server responsible for receiving mail for that domain. You can use online tools like MXToolbox or dig to perform the lookup.

Example: dig mx example.com

This will return the MX record for the domain example.com, which may include the IP address of the mail server.

  1. SMTP Header Analysis: When you send an email, the SMTP server that receives the email includes the IP address of the receiving server in the email headers. You can analyze the email headers to find the IP address of the mail receiver.

Example: telnet example.com 25 (replace example.com with the domain of the mail receiver)

This will establish a connection to the SMTP server on port 25. You can then issue the HELO command to initiate the SMTP conversation. The server will respond with its IP address in the 220 response.

  1. Email Header Analysis Tools: There are online tools and software available that can analyze email headers and extract the IP address of the mail receiver. Some popular tools include:
  1. Network Scanning: You can use network scanning tools like Nmap or OpenVAS to scan the IP address range of the mail receiver's domain and identify the IP address of the mail server.

Example: nmap -p 25 example.com (replace example.com with the domain of the mail receiver)

This will scan the IP address range of the domain for open SMTP ports (25) and identify the IP address of the mail server.

  1. Contact the Mail Receiver: If you have a direct relationship with the mail receiver, you can simply ask them for their IP address.

Remember to always respect the privacy and security of the mail receiver's infrastructure when attempting to determine their IP address.