What is RFC SMTP?
Postel [Page 1] August 1982 RFC 821 Simple Mail Transfer Protocol 2. THE SMTP MODEL The SMTP design is based on the following model of communication: as the result of a user mail request, the sender-SMTP establishes a two-way transmission channel to a receiver-SMTP.
What are the components of an RFC 822 email message?
According to RFC 822 standard each message consists of two parts: Envelope: which contains all the necessary information so that the message can be transmitted and delivered to the recipient. Content: which is the information that must be delivered to the recipient, formed by lines of text.
What is the meaning of 221 response code in SMTP?
SMTP Error 221 Error 221 is an authentication error, which means you are using the wrong mail server, the user/password is incorrect, you need to change the authentication method or SMTP access is not enabled for your email account. Try using SSL/TLS if you are sure that the mail server and user/password is correct.
What are the drawbacks of SMTP RFC 822?
SMTP/822 Limitations – Can not transmit, or has a problem with:
- executable files, or other binary files (jpeg image)
- “national language” characters (non-ASCII)
- messages over a certain size.
- ASCII to EBCDIC translation problems.
- lines longer than a certain length (72 to 254 characters)