smtp through telnet

let's say you have an email address of someshid@eimatro.com
you can send email to it using telnet

to get an actual smtp server you need to perform an MX lookup on "eimatro.com"
this is how you do it in windows. open cmd and start typing:

nslookup
set type=MX
eimatro.com

you will get something like
"eimatro.com     MX preference = 10, mail exchanger = mail.eimatro.com"

where "mail.eimatro.com" is the smtp server. type in "quit" to quit.

now open your putty and run telnet on mail.eimatro.com with port 25
port 25 is smtp mail

if you didn't kcuf up, you should see a message of the server welcoming you

type in following stuff:

HELO example.com
MAIL FROM:<admin@example.com>
RCPT TO:<someshid@eimatro.com>
DATA

you will see a bunch of text after each line.

Now the actual message:

From: Admin <admin@example.com>
To: Someshid <someshid@eimatro.com>
Subject: You won $1000!
Content-Type: text/plain

Congrats! You won $1000 by doing nothing! Please follow a link to claim it:
https://natribu.org/en/

.

[this is the end]

Now if you did everything correctly, someshid at eimatro should see a new email.
(That PERIOD at the end of the message is important. It indicates the end of the message.)

Some SMTP servers can block your mail because you have a dynamic IP. In that way
you can try sending an actual email bro

(by the way, someshid@eimatro.com doesn't exist and you should never email people as an admin of example.com. this is bad for your health and can lead to several severe diseases such as ligma)