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Forum Discussion

ajafari_2524's avatar
ajafari_2524
Icon for Nimbostratus rankNimbostratus
Nov 11, 2012

Publishing private IP in Email Header After PAT

Kindly note that we have and F5 implementation as part of a third party solution which we are having problem with.     The issue is that the F5 node is doing PAT on internal IP addresses when...
config
design
Hamish's avatar
Hamish
Icon for Cirrocumulus rankCirrocumulus
Nov 11, 2012
X-Forwarded-For is really for HTTP, although there's not alot to stop you from using it in SMTP as well. It'll get igniored as it's an X- header.

 

 

However a more standard looking way would be to insert a fake received-from header into the SMTP headers so that the BigIP looks like an SMTP hop (i.e. Has both the realIP in one received line and the translated address will be inserted into the next one by the next hop).

 

 

H