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Noel Jones
*nix forums Guru
Joined: 28 Feb 2005
Posts: 776
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 Posted: Mon Feb 13, 2006 8:43 pm Post subject:
RE: Filtering spam - bogus users
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At 12:44 PM 2/13/2006, PostfixSupport wrote:
| Quote: | You can set postfix to automatically reject mail
claiming to be from
bogus virtual senders.
http://www.postfix.org/postconf.5.html#smtpd_reject_unlis
ted_sender
If I understand correctly this will stop users that spoof
one of my
addresses from sending inbound, but won't alter relaying
to me when they
aren't spoofing is that correct?
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That's right, smtpd_reject_unlisted_sender will only check
sender addresses that claim to use a domain you manage. If
the user exists, the mail is processed normally and checked
with any other restrictions you have defined. If the user
does not exist, the mail is rejected.
--
Noel Jones |
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mouss
*nix forums Guru
Joined: 27 Feb 2005
Posts: 1947
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| Posted: Mon Feb 13, 2006 7:36 pm Post subject:
Re: Filtering spam - bogus users
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PostfixSupport a écrit :
| Quote: | You can set postfix to automatically reject mail claiming to be from
bogus virtual senders.
http://www.postfix.org/postconf.5.html#smtpd_reject_unlisted_sender
If I understand correctly this will stop users that spoof one of my
addresses from sending inbound, but won't alter relaying to me when they
aren't spoofing is that correct?
We periodically see this as well and the
"The sender domain matches $relay_domains but the recipient is not
listed in $relay_recipient_maps, and $relay_recipient_maps is not null"
statement seems to match my main concern.
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reject_unlisted_sender rejects mail when the sender is in a domain
"listed" (I mean, users are listed: the corresponding map isn't set to
void) on postfix but the address doesn't exist. This includes
local_recipient_maps, relay_recipient_maps and virtual_mailbox_maps. One
caveat though is that wildcard virtual aliases and canonical break this
validation. |
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PostfixSupport
*nix forums beginner
Joined: 12 Jan 2006
Posts: 11
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| Posted: Mon Feb 13, 2006 6:44 pm Post subject:
RE: Filtering spam - bogus users
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If I understand correctly this will stop users that spoof one of my
addresses from sending inbound, but won't alter relaying to me when they
aren't spoofing is that correct?
We periodically see this as well and the
"The sender domain matches $relay_domains but the recipient is not
listed in $relay_recipient_maps, and $relay_recipient_maps is not null"
statement seems to match my main concern.
Bob |
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Joey
*nix forums addict
Joined: 14 Apr 2005
Posts: 55
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| Posted: Sat Feb 11, 2006 2:52 am Post subject:
RE: Filtering spam - bogus users
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You should reply and leave the message originally sent so you can see
everything at once.
How you described your problem may not be good, and so it may have not made
sense.
Please explain what the problem is and what you are trying to do.
-----Original Message-----
From: Robin Rowe [mailto:rower@movieeditor.com]
Sent: Friday, February 10, 2006 8:01 PM
To: Joey
Subject: Re: Filtering spam - bogus users
Joey,
| Quote: | The from shouldn't allow them to send mail.
Are you allowing mail to relay based on the from instead of using
smtpauth or other methods?
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I'm new to postfix and may not understand your question. The email is being
sent from somewhere else, has a forged from address, and my server as the
final destination. It's not being sent from my server. I don't think postfix
is looking at the from address at all. That's what I'd like it to check.
Robin |
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Joey
*nix forums addict
Joined: 14 Apr 2005
Posts: 55
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| Posted: Fri Feb 10, 2006 9:53 pm Post subject:
RE: Filtering spam - bogus users
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The from shouldn't allow them to send mail.
Are you allowing mail to relay based on the from instead of using smtpauth
or other methods?
-----Original Message-----
From: owner-postfix-users@postfix.org
[mailto:owner-postfix-users@postfix.org] On Behalf Of Robin Rowe
Sent: Friday, February 10, 2006 12:28 PM
To: postfix-users@postfix.org
Subject: Filtering spam - bogus users
How do I kill spam that's forged as being from users who don't exist on my
server, that is, with a from line like bogus@mydomain.com? Further, what if
it's a virtual domain user not in my virtual file, that is,
bogus@myvirtual.com?
Thank you,
Robin |
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Noel Jones
*nix forums Guru
Joined: 28 Feb 2005
Posts: 776
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| Posted: Fri Feb 10, 2006 5:38 pm Post subject:
Re: Filtering spam - bogus users
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At 11:28 AM 2/10/2006, Robin Rowe wrote:
| Quote: | How do I kill spam that's forged as being from users who
don't exist on my server, that is, with a from line like
bogus@mydomain.com? Further, what if it's a virtual domain
user not in my virtual file, that is, bogus@myvirtual.com?
Thank you,
Robin
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You can set postfix to automatically reject mail claiming
to be from bogus virtual senders.
http://www.postfix.org/postconf.5.html#smtpd_reject_unlisted_sender
--
Noel Jones |
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Robin Rowe
*nix forums beginner
Joined: 09 Feb 2006
Posts: 10
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| Posted: Fri Feb 10, 2006 5:28 pm Post subject:
Filtering spam - bogus users
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How do I kill spam that's forged as being from users who don't exist on
my server, that is, with a from line like bogus@mydomain.com? Further,
what if it's a virtual domain user not in my virtual file, that is,
bogus@myvirtual.com?
Thank you,
Robin |
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