Comments on: Postfix blacklist or reject an email address

By: Davo

Davo — Mon, 12 Dec 2011 11:37:39 +0000

Does anyone know of a way to blacklist a sender address that works?

By: Manish

Manish — Sat, 17 Jul 2010 22:21:15 +0000

I would like to block mails coming from all domains and and allow only those mails from the domains which are whitelisted.
If I use
blacklist_from *@* all the domains are marked as SPAM and even the whitelist domains are also makred as spam. How can I place a rule for blocking all other domains editing the /etc/mail/spamassassin/local.cf and or with .procmailrc file. Any suggestion or help would be appreciated.

Thank you
Manish

By: krish

krish — Sat, 08 May 2010 05:40:30 +0000

Respected Sir,
Please help me regarding smtp sender mails block. I need to block some users should not send mails to other domain but they get receipt mail from other domain also they send same domain to each others.

Thanks
krish

By: Nick

Nick — Fri, 05 Feb 2010 15:13:05 +0000

Vivek, PLEASE fix your tutorial above. Following your instructions will make POSTFIX break, and not accept any SMTP connections. The correct line is:

smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/sender_access

Thanks for this tutorial! Besides this minor frustration, GREAT article.

By: John

John — Fri, 11 Dec 2009 01:29:31 +0000

Could this be used as a method of blocking mail sent to a valid user, but with a bogus TO address?

By: Jacki

Jacki — Wed, 11 Mar 2009 15:19:24 +0000

@Tom

Yes it will work & and work as recipient_restrictions. This E-mail address still can send e-mail not receive since theres two separate option in postfix to block e-mail address receiving & sending email to this server.

/etc/postfix/main.cf: smtpd_sender_restrictions = hash:/etc/postfix/sender_access unverified_sender_reject_code = 550 # Postfix 2.6 and later. # unverified_sender_defer_code = 250

# Note 1: Be sure to read the "Caching" section below! # Note 2: Avoid hash files here. Use btree instead. address_verify_map = btree:/var/lib/postfix/verify

/etc/postfix/sender_access: aol.com reject_unverified_sender hotmail.com reject_unverified_sender bigfoot.com reject_unverified_sender ... etcetera ...

/etc/postfix/main.cf: smtpd_recipient_restrictions = permit_mynetworks reject_unauth_destination ... reject_unknown_recipient_domain reject_unverified_recipient ... # Postfix 2.6 and later privacy feature. # unverified_recipient_reject_reason = Address lookup failed

By: Tom

Tom — Mon, 09 Mar 2009 21:00:12 +0000

Thanks for your tips.
I think Jacki have wrong. It’s well smtpd_recipient_restrictions.
(excuse my english i am from France)
Bye

By: Jacki

Jacki — Mon, 09 Mar 2009 14:38:55 +0000

yes I followed your tips.

smtpd_recipient_restrictions = check_sender_access hash:/etc/postfix/sender_access

Should be….
smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/sender_access

Thanks

By: Vivek Gite

Vivek Gite — Sun, 08 Mar 2009 16:57:57 +0000

@Jacki,

Do you see any problem with configuration?

By: Jacki

Jacki — Sun, 08 Mar 2009 13:55:10 +0000

Hey still have problem ? please fixed it. Other wise newbie may be confused?

By: Mihir

Mihir — Mon, 05 May 2008 12:13:52 +0000

I am not able to start internet from RHEL 5
please help me out!!!
plz give step by step instructions

By: neotexan

neotexan — Mon, 21 Jan 2008 17:13:19 +0000

While not stated above, this should work for whitelisting senders as well. Ideal when you don’t want to whitelist someone’s misconfigured exchange server.

By: neotexan

neotexan — Mon, 21 Jan 2008 17:09:14 +0000

Please correct to:

smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/sender_access

Using the given line, the mail server will not accept communication…yet shows to be running.

Test with ‘telnet localhost 25′

Normally, you should get a response such as:
220 {yourmailserverFQDN} ESMTP Postfix

By: vivek

vivek — Tue, 06 Nov 2007 07:15:05 +0000

Thanks for the heads up!

By: Jules

Jules — Mon, 05 Nov 2007 14:56:13 +0000

Thanks! Very helpful.

Ony one slight error: The main.cf line should read:

smtpd_recipient_restrictions = check_sender_access hash:/etc/postfix/sender_access