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Old 16th December 2009, 12:50
till till is offline
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I think your problem is not realted to the spamfilter or ispconfig as these mail headers are not changed by amavisd. I think the only possible solution might be to use postfix header filters to delete or replace header lines that conatin IP addresses from private networks like 192.168.*

A header check like this might work:

/^Received:.*\[(192\.168|172\.(1[6-9]|2[0-9]|3[01])|10)\./ IGNORE
/^Received:.*\[127\.0\.0\.1/ IGNORE

See also here:
Till Brehm
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