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Port 25 - SMTP

Chat GPT3 description generated

SMTP (Simple Mail Transfer Protocol) is a network protocol used to send and receive email messages between email servers. It is a text-based protocol that defines the rules and format for email messages and how they are exchanged between email servers.

SMTP operates over TCP/IP and is primarily used by mail servers to send outgoing messages to other mail servers for delivery to their intended recipients. SMTP uses a client-server architecture, where an email client or sending server connects to the destination server and sends the email message using the SMTP protocol.

SMTP works in a step-by-step process, where the sending server first establishes a connection with the receiving server using the Transmission Control Protocol (TCP). Once the connection is established, the sending server sends a series of commands and responses to the receiving server, which includes identifying the sender and recipient of the email, checking for message errors, and transmitting the actual message content. The receiving server then stores the message and sends a confirmation message back to the sending server, indicating that the message was received and accepted.

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Email enumeartion via external services

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User enumeration

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Automated tools

### smtp-user-enum ### 
smtp-user-enum -M VRFY -U users.txt -t 10.0.0.1
smtp-user-enum -M EXPN -u admin1 -t 10.0.0.1
smtp-user-enum -M RCPT -U users.txt -T mail-server-ips.txt
smtp-user-enum -M EXPN -D example.com -U users.txt -t 10.0.0.1

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VRFY

The VRFY command in SMTP (Simple Mail Transfer Protocol) is used to verify the existence of a specific email address on a mail server.

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EXPN

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RCPT TO

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