What is the SMTP RCPT clause?
RCPT is a command used in an electronic mail transaction. Below are the main commands used when mail is sent via SMTP.
HELO – The client "signs on" to the server using the HELO command
MAIL FROM – The client must tell the server who the mail is from
RCPT TO – Who the mail is going to
DATA – Ready for the actual message input
QUIT – If no errors, the message would have been sent, close the connection
So the RCPT clause defines the receiver of the mail message. You cannot specify more than one address at the MAIL FROM clause, however you are able to add many RCPT clauses. You would expect this as mail clients let you send to more than one address per e-mail (CC/BCC). For example:
MAIL FROM: Anyone@anywhere.dom 250 OK - (Server acknowledges and accepts) RCPT TO: User1@Anotherdomain.dom 250 OK RCPT TO: User2@Anotherdomain.dom 250 OK RCPT TO: User3@Anotherdomain.dom 250 OK
GMS Anti-Spam has options that can perform a reverse DNS lookup on the IP address of the given host ensure it matches the address given in the RCPT clause.
- What is the SMTP MAIL clause?
- What is SMTP?
- What is the SMTP DATA clause?
- What is the SMTP HELO/EHLO clause?
Keywords:RCPT SMTP Lookup