Smtp_mail
SMTP (Simple Mail Transfer Protocol) is a protocol used for sending and receiving email messages over the internet. It is a standard protocol used by email clients and servers to exchange email messages.
Here is a basic overview of how SMTP works:
- An email client (such as Microsoft Outlook or Mozilla Thunderbird) connects to an SMTP server using the SMTP protocol.
- The email client sends an email message to the SMTP server, which then forwards the message to the recipient's email server.
- The recipient's email server receives the email message and stores it in the recipient's email inbox.
- The recipient can then access their email inbox using an email client or web-based email service.
SMTP is a simple protocol that uses plain text commands and responses to send and receive email messages. It is widely used and supported by most email clients and servers.
Here are some common SMTP commands:
- HELO: Hello command, used to initiate a connection to an SMTP server.
- MAIL FROM: Command used to specify the sender's email address.
- RCPT TO: Command used to specify the recipient's email address.
- DATA: Command used to send the email message.
- QUIT: Command used to close the connection to the SMTP server.
Here is an example of an SMTP conversation:
HELO client.example.com
250 client.example.com Hello, welcome to our SMTP server!
MAIL FROM: <[email protected]>
250 [email protected]... Sender ok
RCPT TO: <[email protected]>
250 [email protected]... Recipient ok
DATA
354 Start mail input; end with <CRLF>.<CRLF>
Subject: Test email
This is a test email.
.
250 Message accepted for delivery
QUIT
221 Bye, goodbye!SMTP is a widely used protocol, but it has some limitations. For example, it is not secure, as it sends email messages in plain text. This makes it vulnerable to eavesdropping and tampering. To address this issue, a secure version of SMTP called SMTPS (SMTP over SSL/TLS) was developed. SMTPS uses encryption to protect email messages in transit.