suppressing DSN postfix

[Dan MacNeil]

We're running postfix

Our primary mail server was off-line for 4 days.  (We were at the mercy
of state employees who don't work holidays)

24 hours into the problem , we setup a backup MX w/ only filtering being
the postfix relay_domains parameter.

Our primary (and ordinary only) mail server rejects SPAM and viruses @
RECPT time.

As I release mail in 20 message chunks from the 3000 message backlog on
the secondary , I'm generating a good bit of backscatter.

Is there any easy automatic way to move DSN (delivery service
notification) messages into the hold queue on the secondary so I can
deal with them at my leasure?


Am I explaining the problem clearly enough ?


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[Mike Bird-2]

On Mon July 7 2008 15:16:12 Dan MacNeil wrote:

> We're running postfix
>
> Our primary mail server was off-line for 4 days.  (We were at the mercy
> of state employees who don't work holidays)
>
> 24 hours into the problem , we setup a backup MX w/ only filtering being
> the postfix relay_domains parameter.
>
> Our primary (and ordinary only) mail server rejects SPAM and viruses @
> RECPT time.
>
> As I release mail in 20 message chunks from the 3000 message backlog on
> the secondary , I'm generating a good bit of backscatter.
>
> Is there any easy automatic way to move DSN (delivery service
> notification) messages into the hold queue on the secondary so I can
> deal with them at my leasure?
>
>
> Am I explaining the problem clearly enough ?

I hope there's a clean solution, but if not you could temporarily block
outbound SMTP (e.g. with iptables), process the backlog, then use some
grep/awk magic to purge the backscatter from the mailq.

--Mike Bird


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[Dan MacNeil]

bottom posting 'cause I'm kwel

Mike Bird wrote:

> On Mon July 7 2008 15:16:12 Dan MacNeil wrote:
>> We're running postfix
>>
>> Our primary mail server was off-line for 4 days.  (We were at the mercy
>> of state employees who don't work holidays)
>>
>> 24 hours into the problem , we setup a backup MX w/ only filtering being
>> the postfix relay_domains parameter.
>>
>> Our primary (and ordinary only) mail server rejects SPAM and viruses @
>> RECPT time.
>>
>> As I release mail in 20 message chunks from the 3000 message backlog on
>> the secondary , I'm generating a good bit of backscatter.
>>
>> Is there any easy automatic way to move DSN (delivery service
>> notification) messages into the hold queue on the secondary so I can
>> deal with them at my leasure?
>>
>>
>> Am I explaining the problem clearly enough ?
>

> --Mike Bird
> I hope there's a clean solution, but if not you could temporarily block
> outbound SMTP (e.g. with iptables), process the backlog, then use some
> grep/awk magic to purge the backscatter from the mailq.

Thanks.

I think I have it going.

# In /etc/postfix/main.cf

    # apply checks to bounce and notify
internal_mail_filter_classes = bounce notify

    # use these body checks
body_checks = regexp:/etc/postfix/body_checks


# in /etc/postfix/body_checks

/5.7.1.*Your message looks like SPAM please contact intended recipient/
     HOLD move spam backscatter to hold queue
/ 550 Virus Detected;/
   HOLD move backscatter virus to hold queue


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