Open connection

Command:

          telnet mail.domain.tld 25

You should normally receive something like this:

          Trying 000.000.000.000...

Say hello

Command:

          HELO local.domain

Answer (normally):

          250 mail.domain.tld

Set the sender

Command:

          MAIL FROM: user@domain.tld

Answer (normally):

          250 OK

Set the recipient

Command:

          RCPT TO: user@domain.tld

Answer (normally):

          250 OK

Compose the message

Command:

          DATA

Answer (normally):

          354 go ahead

Start writing content in the message

Insert data:

          Subject: "Hello World!"

Sending the message

Enter a new line after the last word you have written. Add only a . (dot) to this line. Hit enter.

          .

If everything was ok you should receive a message like this and the mail should be sent:

          250 ok 1090795155 qp 29731

That’s it.

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