Why are you trying to mess with Received: lines? That's a VERY bad idea.
RFC 2821 discourages this kind of thing most strongly:
3.8.2 Received Lines in Gatewaying
When forwarding a message into or out of the Internet environment, a
gateway MUST prepend a Received: line, but it MUST NOT alter in any
way a Received: line that is already in the header.
Unrelated side-note, I've been considering modifying the received headers to
remove IP relays because of Barracuda, for example, is doing deep header
parsing on received headers.
We've had a number of issues now where I've seen internal and bug reports
for SA that turned out to be DHCP addresses from BIG providers like Verizon
that are rotated to the next customer. Then the customer uses those
addresses to properly authenticate and relay only to be marked/blocked as a
spammer!
Regards,
KAM
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