Re: smtpd_recipient_restrictions with empty from= envelope

2014-08-20 Thread ml ml
Hello Robert, thanks for your reply. Can i also set the original sender address as the address_verify_sender? I wasnt able to find anything in the manual :-/ Thanks, Mario On Fri, Aug 15, 2014 at 11:12 AM, Robert Schetterer r...@sys4.de wrote: Am 15.08.2014 um 10:36 schrieb

mail relay and local users

2014-08-20 Thread Juerg Reimann
Hi there I have a running Postfix configuration with several domains and local users (virtual_mailbox_maps). Is it possible to also use that system as a mail relay (inward and outward) in front of an MS Exchange system? Does anybody know some how tos for that? Thanks a lot! Juerg

how to protect MTAs from mass mails

2014-08-20 Thread ml ml
Hello list, from time to time i get hit by mass mail with fake sender addresses. By default my postfix accepted those mails until it found out that the recipent does not exists. Then postfix tries to send back that 550 User Unknown error mail. However, the sender is fake. Therefore the mails

Re: smtpd_recipient_restrictions with empty from= envelope

2014-08-20 Thread Wietse Venema
ml ml: Hello Robert, thanks for your reply. Can i also set the original sender address as the address_verify_sender? I wasnt able to find anything in the manual :-/ It is not documented, therefore it is not supported. Wietse

Re: mail relay and local users

2014-08-20 Thread Wietse Venema
Juerg Reimann: Hi there I have a running Postfix configuration with several domains and local users (virtual_mailbox_maps). Is it possible to also use that system as a mail relay (inward and outward) in front of an MS Exchange system? Does anybody know some how tos for that? Yes. For

Re: smtpd_recipient_restrictions with empty from= envelope

2014-08-20 Thread ml ml
Hi Wietse, may i kindly ask why the original sender address cant be passed for the address_verify_sender feature? Is there a specific reason? Thanks a lot, Mario On Wed, Aug 20, 2014 at 1:07 PM, Wietse Venema wie...@porcupine.org wrote: ml ml: Hello Robert, thanks for your reply. Can i

Re: how to protect MTAs from mass mails

2014-08-20 Thread Larry Stone
On Aug 20, 2014, at 3:56 AM, ml ml mliebher...@googlemail.com wrote: rom time to time i get hit by mass mail with fake sender addresses. By default my postfix accepted those mails until it found out that the recipent does not exists. Then postfix tries to send back that 550 User Unknown

Re: how to protect MTAs from mass mails

2014-08-20 Thread Daniele Nicolodi
On 20/08/2014 10:56, ml ml wrote: By default my postfix accepted those mails until it found out that the recipent does not exists. Then postfix tries to send back that 550 User Unknown error mail. I doubt that Postfix by default accepts mail for users it does not know about, but anyway...

Re: how to protect MTAs from mass mails

2014-08-20 Thread L. D. James
On 08/20/2014 07:44 AM, Daniele Nicolodi wrote: On 20/08/2014 10:56, ml ml wrote: By default my postfix accepted those mails until it found out that the recipent does not exists. Then postfix tries to send back that 550 User Unknown error mail. I doubt that Postfix by default accepts mail for

Re: smtpd_recipient_restrictions with empty from= envelope

2014-08-20 Thread Wietse Venema
ml ml: Can i also set the original sender address as the address_verify_sender? I wasnt able to find anything in the manual :-/ Wietse: It is not documented, therefore it is not supported. ml ml: may i kindly ask why the original sender address cant be passed for the address_verify_sender

Re: how to protect MTAs from mass mails

2014-08-20 Thread L. D. James
Try using the relay_recipient_maps feature which will only accept mails in that list. -- L. James -- L. D. James lja...@apollo3.com www.apollo3.com/~ljames On 08/20/2014 04:56 AM, ml ml wrote: Hello list, from time to time i get hit by mass mail with fake sender addresses. By default my

Re: smtpd_recipient_restrictions with empty from= envelope

2014-08-20 Thread Robert Schetterer
Am 20.08.2014 um 13:38 schrieb ml ml: Hi Wietse, may i kindly ask why the original sender address cant be passed for the address_verify_sender feature? Is there a specific reason? What are you trying to solve here ? please reread http://www.postfix.org/ADDRESS_VERIFICATION_README.html

RE: mail relay and local users

2014-08-20 Thread Juerg Reimann
From: owner-postfix-us...@postfix.org [mailto:owner-postfix- us...@postfix.org] On Behalf Of Wietse Venema Juerg Reimann: Hi there I have a running Postfix configuration with several domains and local users (virtual_mailbox_maps). Is it possible to also use that system as a mail

Re: how to protect MTAs from mass mails

2014-08-20 Thread ml ml
This setup is not very unusual if you have a lager network. Then you have multiple mailout servers for send/deliver the mails. How could i possibly control recipients that do not belong to me?! This is my config: -- postconf -n alias_database = hash:/etc/aliases

Re: how to protect MTAs from mass mails

2014-08-20 Thread Wietse Venema
ml ml: This setup is not very unusual if you have a lager network. Then you have multiple mailout servers for send/deliver the mails. How could i possibly control recipients that do not belong to me?! If your MTA is an outbound relay for an internal network, then you could certainly require

Re: how to protect MTAs from mass mails

2014-08-20 Thread Larry Stone
On Wed, 20 Aug 2014, ml ml wrote: This setup is not very unusual if you have a lager network. Then you have multiple mailout servers for send/deliver the mails. How could i possibly control recipients that do not belong to me?! You failed to adequately describe the problem. We assumed you

PERMIT versus OK

2014-08-20 Thread Ronald F. Guilmette
[[ My apologies to all if you see this message twice, or even three times. Various and multiple snaufs on my end are to blame, and I'm sorry. ]] -=-=-=-=-=-=-=-=-=-=-=- As I was reading again, just now, through the various online documents and man pages relating to filtering, I realized

Re: PERMIT versus OK

2014-08-20 Thread Wietse Venema
Ronald F. Guilmette: This page: http://www.postfix.org/SMTPD_ACCESS_README.html says that evaluation stops when a result of PERMIT, REJECT or DEFER is produced. This describes smtpd_mumble_restrictions, where permit, defer, reject, etc. may appear in a LIST OF THINGS. However this

rewriting from and reply-to headers: milter vs canonical maps/header checks

2014-08-20 Thread Venkat
Hi all, Apologies in advance if this is a redundant query. I did some searching on the previous list posts and wasn't able to find a definitive recommendation on this. What I am trying to do is: Setup a SMTP relay for outgoing mail where: (a) All From: headers of the form u...@cooldomain1.com