I ran into a problem earlier today sending mail from my phone via Exim 4 on my server.
My phone has a randomly chosen IPv6 address (within my /64) thanks to IPv6's privacy features. The phone's IP has no reverse DNS. It relays mail up to my server, which has a static IPv6 address with reverse DNS. Unfortunately, it seems Google bounce all mail received by their servers with *any* IPv6 address in the Received: headers which does not have reverse DNS. Leaving aside how broken this behaviour is, I'm trying to work round it in my Exim configuration. Disabling IPv6 for Exim altogether would be an effective if rather brutal and backward-looking option. Disabling IPv6 per target domain is also possible and less brutal, but the trouble is the number of them - plenty of people use Google Apps for their own domains, so a simple regex match on gmail won't cut it. So what I would like is to have exim do this: IF message is to be delivered to *.google.com via the remote_smtp transport THEN delete Received: headers containing IPv6 addresses matching my /64 AND possibly add an X-Received header with the deleted content and some pithy remark about Google being idiots. Is this possible within Exim? Having spent some time with the documentation, it looks like the remote_smtp transport has access to the target MX hostname in $host, but I can't see a way to conditionally drive some header removal/addition from this if $host matches *.google.com. I could do it in a programming language of my choice invoked via transport_filter, but I'd rather not involve a separate process in this stage of delivery. Thanks, David -- David North | http://www.dnorth.net -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
