abhishek singh schrieb:
Do not top-post please.
yes i am using SMTP Authentication , but when i m doing telnet to my server on 25 port so i am able to send mail by unknow user that in in not my mail server like
mail from: abs@domain.com
The syntax isn't correct: there has to be no space in between
MAIL FROM:abs@domain.com
this command is showing Sender is ok while its not user in my mail server.after that
rcpt to: xyz@domain.com DATA jhsjhdf . quit
after this mail is queued for delivery to xyz user and in this scenario xyz is valid user accound on my mail server so i want that unkown account for my domain cant sendmail , so how i will do that ,
when i am sending mail to out side domain without authentication then everything is ok means any one can send mail to my domain while he is not user.
That makes no sense.
this is the problem.
I do not see "the problem" from above statement. Just understand your question about avoiding to receive mail from faked senders (see below).
i have one solution , but i want to know very easy way to do that
http://www.sendmail.org/~ca/email/fake.html
Alexander