Shulou(Shulou.com)06/02 Report--

Send and receive email by WEB:

1. After the local client has finished writing the email, click send. The message is saved in the outbox of the mail server.

two。 Go to the DNS server to find the IP address of the mail server under the other party's domain name. Find the other party's post office address by looking up MX records.

3. The outbox of the local mail server uses the SMTP (port 25) protocol to send mail (without authentication) to the inbox of the other post office. Only by opening port 25 on the firewall (TCP protocol) can you receive mail sent to you by others.

The mail server client sends and receives mail:

1. Find the address of the receiving and sending mail server

POP: can only access the mail server's inbox (port 110p). After receiving, the mail server will be gone.

IMAP: Mail server synchronizes with client

SMTP: client mail is sent to the outbox of the mail server. The mail server goes to the DNS server to find MX to find the other side's server, and then sends it to the other party's mail server using the SMTP (25) protocol.

two。 The mail server does not allow clients to use anonymous accounts to send and receive mail.

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