Postfix

how to stop backscatter without check headers
Is there a best way to stop backscatter spam without using check headers? Traffic is too heavy to user check headers + we received email for three different domains. Using postfix 2.6. Thanks, motty ... 12 Jun 2010 03:57

smtpd_bind_address
I have smtpd_bind_address set to the delegated ip for our mail server 173.50.101.12; however this only limits incoming connections to that ip, along with our firewall; it USE to, on postfix, make postfix send out from that ip only. Now, postfix is sending out on the main ip of the mail server, 173.50.101.11, wh... 10 Jun 2010 19:03

smtpd_reject_unlisted_recipient
smtpd_reject_unlisted_recipient = no Would this be better put by itself or under smtpd_recipient_restrictions = reject_unlisted_recipient=no? I want to accept all mail to non-existent users, then bounce, so that people can't probe for valid users to know wherer to start a brute force. ... 11 Jun 2010 10:19

Detecting "telnet"?
On 6/10/2010 5:31 PM, Ralf Hildebrandt wrote: I heard that there are firewalls/security appliances that supposedly can distinguish "somebody using telnet" from "a machine speaking SMTP". I must admit, it sounds feasible (timing between keystrokes etc.), but little useful. Anyway. Is there such a th... 11 Jun 2010 13:40

dealing with Yahoo slowness
There seems to be a massive difference between the speed of various providers, in terms of accepting messages for delivery. Yahoo stands out as, by far, the slowest of the big ones. Because the messages are legitimate, we signed up for the email feedback loop with Yahoo, so that messages flagged as spam by Yah... 1 Jul 2010 05:36

Mail Delivery Using FILTER in access table
Hi All, I have a normal postfix setup with a external content filtering(amavis). I want to skip content filtering for some domains and send through a different IP. In my main.cf I have smtpd_sender_restriction = check_sender_access hash:/etc/postfix/access.cf Where access.cf contains the below line exa... 10 Jun 2010 14:33

Mail forward only using virtual_alias_maps
I am trying to setup a server that will be only used for mail forwarding and will not have any local mailboxes on it. I am trying to have virtual_alias_maps as the sole lookup and any other mail is rejected during the SMTP session after the RCPT TO command if the address is not found in virtual_alias_maps. I h... 10 Jun 2010 19:03

Spoofed freemail domains protection not working for postmaster
����������� ������ put forth on 6/10/2010 4:15 AM: I'd attack the problem from another angle. You may be better served by adding some more dnsbl checks rather that fighting spoofs: http://www.mxtoolbox.com/SuperTool.aspx?action=blacklist%3a111.67.207.126 As you can see the IP sample you gave is already listed ... 17 Jun 2010 13:25

"Invalid size declaration"?
Today I found this double-bounce: ----- Forwarded message from Mail Delivery System <MAILER-DAEMON(a)charite.de> ----- <bounce-25280559(a)customer110.goolara.net>: host customer110.goolara.net[209.209.90.110] said: 552 Invalid size declaration. (in reply to MAIL FROM command) Reporting-MTA: dns; mail-aus... 10 Jun 2010 07:47

Postfix chroot on RHEL5....
Hi: I've a question about setting up postfix in a chroot on a Linux RHEL5 setup. I'm using the RedHat package of postfix (Version 2.3.3) which was installed with the RedHat install. Everything is working fine, but now I want to chroot it. On the Postfix website, it says: "In order to enable chroot operation... 9 Jun 2010 15:19