Almost nothing can be done with professional spammers. Unfortunately. You may refer to RFC on SMTP-protocal (Request For Comments). RFC are official standart.
This is how spammer may work. Typed by hand in unix terminal session what e-mail software does:
> host anybody.com
anybody.com has address 20.1.27.18
anybody.com mail is handled (pri=10) by mail.freeservers.com
> telnet mail.freeservers.com 25
Trying 20.1.27.11...
Connected to mail.freeservers.com.
Escape character is '^]'.
220 mail.freeservers.com ESMTP Postfix
ehlo spammer
250-mail.freeservers.com
250-PIPELINING
250-SIZE 5120000
250-VRFY
250-ETRN
250-XVERP
250 8BITMIME
mail from: <>
250 Ok
rcpt to: postmaster@freeservers.com
250 Ok
data
354 End data with <CR><LF>.<CR><LF>
From: any_email_can_be@put.here
To: anything-you-like@email.kids
spam
.






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