Reject incoming email for specific user - postfix

By default, the Postfix SMTP server accepts any sender address. However you can block / blacklist sender email address easily with Postfix. It has SMTP server access table.

Open /etc/postfix/sender_access file
# cd /etc/postfix
# vi sender_access

Append sender email id as follows:
user@abadboy.com REJECT

Save and close the file. Use postmap command to create a database:
# postmap hash:sender_access

Now open main.cf and add code as follows:
smtpd_recipient_restrictions = check_sender_access hash:/etc/postfix/sender_access

Save and close the file. Restart / reload postfix MTA:
# /etc/init.d/postfix restart

You can also use spamassassin to blacklist email address. Just add to your own spamassassin configuration or to /etc/mail/spamassassin/local.cf file:
# vi /etc/mail/spamassassin/local.cf

Append blacklist as follows:
blacklist_from user@abadboy.com

Save and close the file. Restart spamassassin:
# /etc/init.d/spamassassin restart

spamassassin will marke mail as SPAM instead of rejecting the same.

Thanks for quick response, My requirement is different I need to block mails to particular mail id in my mail server. for example.. my domain name is abc.com I have created user as 1@abc.com, 2@abc.com... . Now 1@abc should not receive any mail from out side (external mails).
In this case, how to move forward.

Thanks

You would need to use a filter prior to delivery checking if the sender is external to the local domain, then either reject or drop the message.

What is the reason for the close selecting a comment that NLA doscribes what you want?
I provided you various suggestions to achieve it depending on what your setup is.

Hi Arnold, Please let me know what went wrong with me?

I do not know, you commented what you want and the selected that comment as the answer.

To limit an email to receiving only internal emails, meaning from local/known domains means that you have to make that determination either during the local delivery using a filter that checks the sending domain against a list of allowed or implement some milter on the incoming (SMTP session processing) which has a backend db, or someway to reference incoming recipient and their rules/rights.

....

How many such users/email addresses do you have? What does your mail setup consist of, post of, backend MySQL, etc?

we are using Postfix Mail server with about 100 users.

Thanks