Spam/bounce problem

Tony Johansson tony.johansson at SVENSKAKYRKAN.SE
Thu Dec 18 16:49:29 GMT 2003

On Thu, 18 Dec 2003 10:16:42 -0600, James Pattie <james at PCXPERIENCE.COM>

>| The flow is something like this:
>| 1. Spammer sends spam to abc at, spam has the spoofed return
>| address xyz at
>| 2. No such user at full/disabled etc
>| 3. Mail bounces to xyz at (with return path "<>")
>| 4. Smtpgate at (running mailscanner) accepts message, forwards
>| to internal server
>| 5. Internal server sees that the address xyz at is non-existant
>| 6. Internal server tries to bounce the message, to xyz at, but
>| naturally it cannot be delivered
>| 7. Message is sent to postmaster at, "I tried to deliver a bounce
>| message to this address, but the bounce bounced!"
>| Does anyone have a remedy for this problem?
>use the sendmail double bounce suppression feature talked about recently
on this

Yes, but that would only help step 7. That step is no problem, apart from
all the emails to postmaster.

Its step 4 that has problems keeping up.

Since its quite hard to separate "real" bounces from those described above,
I think the best solution would be to somehow put all incoming bounces in a
separate, putting real email in a higher priority queue.

Question is, how?...

Regards, Tony

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