Postfix - antispam and relay package

zlyzwy

Hi Marcelloc,

I have one question, some mail server is continuing sending spam email to my server.
It brings me a lot of useless log in Search Mail(NOQUEUE).

May 28 15:41:58	xxx@xxx.com	aaa@aaa.cn	reject
May 28 15:42:58	xxx@xxx.com	aaa@aaa.cn	reject
May 28 15:43:58	xxx@xxx.com	aaa@aaa.cn	reject
May 28 15:44:58	xxx@xxx.com	aaa@aaa.cn	reject
May 28 15:45:58	xxx@xxx.com	aaa@aaa.cn	reject
May 28 15:46:58	xxx@xxx.com	aaa@aaa.cn	reject
May 28 15:47:58	xxx@xxx.com	aaa@aaa.cn	reject

I add the rule in Access List –> Sender

xxx@xxx.com RJECT
bbb.com REJECT

But I found I still can see these log in Search Mail.

Can I just block these mail address somewhere? Or maybe there will have a filter for log?

Thanks for your great work!
Zlyzwy

marcelloc

The noqueue log means that the message was rejected before mail data.

To do not receive this error, you will need to configure a firewall rule for these ips.

att,
Marcello Coutinho

zlyzwy

@marcelloc:

The noqueue log means that the message was rejected before mail data.

To do not receive this error, you will need to configure a firewall rule for these ips.

att,
Marcello Coutinho

In fact, I has tried this method already, however it seems it doesn't work.
I have pfBlocker installed, I put the spam ip into the Custom list, eg:

111.222.333.444/32  #xxx@xxx.com

Then I still see the NOQUEUE log…

marcelloc

@zlyzwy:

In fact, I has tried this method already, however it seems it doesn't work.
I have pfBlocker installed, I put the spam ip into the Custom list, eg:
111.222.333.444/32 #xxx@xxx.com

can you check on diagnostics table if this ip is listed on pfblocker alias?
what action did you selected on pfblocker?

pfBlocker is a nice package ;), but for this rule, you need just an alias and a rule on wan.

att,
Marcello Coutinho

zlyzwy

can you check on diagnostics table if this ip is listed on pfblocker alias?

Yes, it's.

what action did you selected on pfblocker?

Deny Inbound

I can see the packets which has been blocked by PFblocker from Dashboard..

marcelloc

Check the log, it may be coming from more than one ip.

zlyzwy

@marcelloc:

Check the log, it maybe comming from more then one ip.

You are right… there are three ips from one address.

I blocked them all and it's now OK~

Thanks for your help~

ics

Hi,

In Postfix, is it possible to forward emails to specific servers depending on the recipient email address (not only on the domain) ?

Thank you

marcelloc

not yet. :(

zlyzwy

Hi Marcelloc,

Can I add the NOQUEUE email address to Whitelist?
Some of mail server can't pass 'Helo Hostname' check….

As my understanding, the "access lists" will only work with QUEUE email address.

Thanks in advance~

Zlyzwy

marcelloc

The noqueue info in log file are for messages that failed during header check.

to workaround it,you can:

unselect the helo check on config gui
add the host hello info to /etc/hosts (check if pfsense boot process does not clean this file)
if you really trust the remote domain, add it to mynetworks.

But the best way is to ask remote site admin to fix his smtp configuration.

ics

Hi,

In Search Mail some emails have status "sent" even if it's detected as spam (maillog).
And for some other emails status "spam" is obviously correct. :)

Any explanation ?

Another question :
the subject displayed is the original subject of the email. Is it possible to view the modified subject also ?

Thanks

marcelloc

@ics:

Any explanation ?

Are you using mailscanner too? if so, there are som actions that sends the spam message just changing the subject, so the last action of this message_id is sent as postfix sent it to user.

@ics:

the subject displayed is the original subject of the email. Is it possible to view the modified subject also ?

Not yet, the databased is filled by maillog file, the subject is logged only when messages arrives.

biggsy

Hi Marcello,

I have an IronPort box that's been trying to bounce the same mail to my mail server, on the hour for nearly three days.

The sender address is being rejected for obvious reasons:

NOQUEUE: reject: RCPT from ironport2-out.teksavvy.com[206.248.154.182]: 450 4.1.8 mailman-bounces@localhost.localdomain: Sender address rejected: Domain not found; from= mailman-bounces@localhost.localdomain…

I tried to whitelist the server, blacklist it and a bunch of other things but the reject_unknown_sender_domain still kicks in and, becasue it's only a 450 response, they try again an hour later.

I thought I'd try "soft_bounce=no" but the GUI won't allow me to set that.

I can get soft_bounce=yes by setting soft bounce to "enabled" in the GUI but selecting either "Only in PostScreen" or "Disabled" just clears soft_bounce from main.cf.

I thought Disabled should set soft_bounce=no but wanted to ask what you think?/mailman-bounces@localhost.localdomain /mailman-bounces@localhost.localdomain

marcelloc

The best way to receive this bounce is to send an email to remote site sysadmin explaining his server misconfiguration.
To workaround for this misconfigured server, enable dns forwarder service and add missing domain/host as a Host Override.

I thought Disabled should set soft_bounce=no but wanted to ask what you think?

postfix documentation says that soft_bounce default value is no, so if it's not declared, then soft_bounce=no.

soft_bounce (default: no)
Safety net to keep mail queued that would otherwise be returned to the sender. This parameter disables locally-generated bounces, and prevents the Postfix SMTP server from rejecting mail permanently, by changing 5xx reply codes into 4xx. However, soft_bounce is no cure for address rewriting mistakes or mail routing mistakes.

Example:

soft_bounce = yes

att,
Marcello Coutinho

ics

Hi,

My Postfix rejects emails from a server with the error : "Client host rejected: cannot find your hostname"
However, the IP address is perfectly resolvable.
And in maillog :
"warning: ...: hostname domain.net verification failed: hostname nor servname provided, or not known"

I tried to add the IP address in MyNetworks, no change.

Do you know what is misconfigured ?

Thanks

marcelloc

The ip address is resolvable, but hostname that server sent on smtp header is?

Sometimes this wrong hostname is sent on servername or helo info.

ics

postfix says :
RCPT from unknown[IP_Address]: 450 4.7.1 Client host rejected: cannot find your hostname
The helo is correct and correspond to the IP address when resolved.

The hostname in smtp header is the HELO ?
If not where can I find it in the log ?

Anyway, why is it still rejected while the IP is in MyNetworks ?

marcelloc

@ics:

Anyway, why is it still rejected while the IP is in MyNetworks ?

even on MyNetworks, the email must be correct.
The mynetworks will allow this ip to relay to any domain.

Add this ipname on dns forwarder host override list and check if it pass the resolv test.

att,
Marcello Coutinho

ics

@marcelloc:

Add this ipname on dns forwarder host override list and check if it pass the resolv test.

It works.

Thank you