Re: Apply custom transport to MX hostname
/dev/rob0 <rob0 <at> gmx.co.uk>
2012-08-18 22:13:30 GMT
Please do not hijack threads. When starting a new thread on list, you
should do a "new message" rather than a "reply to list". Thank you.
On Sat, Aug 18, 2012 at 02:32:45PM -0700, Henry Stryker wrote:
> I have defined a few custom smtp transports to limit deliveries to
> certain large domains such as Yahoo and Hotmail. These are applied
> via the transport map file to match recipient address domains.
Hmmm, in general I think this is not worth the trouble.
> There are a large number of recipients I would like to use a custom
> transport for, but whose actual recipient address domains are all
> different. The common bond among them is they all use the same MX.
> These are personal domain names hosted by GoDaddy, so they all use
> smtp.secureserver.net as the primary MX.
>
> Is there a way to apply a custom smtp transport to the MX hostname,
> rather than the recipient address domain?
You can use check_recipient_mx_access with a FILTER action. However,
you should be aware that this affects all recipients of a multi-rcpt
message, so it might not always work as hoped.
Why do you need to do this?
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Background: We have a postfix setup which can only check users quota after postfix accepted the message. As you can imagine we produce a lot of backscatter. Until now the procedure was to manually check mailq and delete mails from "well-known" users which never clean up their mailboxes (do not blame me about that, I just started to work there 4 weeks ago
) So I thought that must be solved somehow easier and more automatically. My basic idea is to regularly scan the mailq for mails defered by "overquota". From these mails in queue I fetch the recipients and add them to a recipient-restriction file for postfix. So postfix can reject such mails before the queue. <<snip>> #!/bin/bash LIMIT=10 TFILE=$(mktemp) mailq | tail -n +2| awk 'BEGIN {RS = ""} /over quota/ {print $NF}' | grep -v maildrop: | sort -n | uniq -c | sort -nr | awk '{if($1> '"$LIMIT"') print $2}' > $TFILE while read line ; do echo "$line 550 Account $line is overquota and cannot receive mails" >> /root/overquota done <$TFILE cp -f /root/overquota /etc/postfix/ postmap /etc/postfix/overquota
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