On 15 Mar 2013, at 10:34, Rob Gunther <[email protected]> wrote: > I am working on an SRS/SPF solution, I have created a router that does will > re-write the from envelope only if the sending domain has an SPF entry. > > I'm using this: > > condition = ${if match{${lookup dnsdb{>\n; > defer_never,txt=$domain}}}{\N(?m)^v=spf1\s\N} {1}{0}}
You might also want to check for an SPF record, as well as an SPF string in a TXT record. But the problem here is using $domain (The recipient domain) rather than $sender_address_domain If you have Exim compiled with SPF support (see https://github.com/Exim/exim/blob/master/doc/doc-txt/experimental-spec.txt) , then you could put this into an ACL with a much simpler test like: spf = none The docs say "none" means "The queried domain does not publish SPF records" > The condition is working, if the domain has no TXT record then it does > nothing to the sender address. > > The problem I am having is I am also adding a header to the router: > > headers_add = "X-SRS: Sender address rewritten from <$sender_address> to > <${quote_local_part:${local_part:$address_data}}@${domain:$address_data}>" > > That header is being added to every message, even if the sender address was > not altered. I thought it would only do that if the conditions(s) for the > router were met but apparently not. I think you may need to put the conditions before the headers_add directive. Certainly logging directives are executed regardless of later conditions. > So 2 questions: > > 1) Can I fix this easily with some command? > 2) I think I can do it by wrapping a condition into the headers_add option > (based on some searching), that option seems complex to figure out - but > more importantly would the router do the DNS check two times? Once for the > condition on the router itself and again to figure out if the headers_add > would be added? I think the DNS lookup is cached. So it would not be performed twice, but the result should be available. > > Robert G. > -- > ## 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/ -- Ian Eiloart Postmaster, University of Sussex +44 (0) 1273 87-3148
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