Looks like I might have replied to Kris and not the maillist. Sorry if this shows up twice.
Made a couple adjustments to the two patterns and merged them into one if anyone is interested. /^\[[^\]]+ (?:helo|rdns)=[\w\d.]+\.(?:outbound-e?mail|shared)\.sendgrid\.net / On Thu, Jul 16, 2020 at 11:07 AM Kris Deugau <kdeu...@vianet.ca> wrote: > Pedro David Marco wrote: > > Is there any way to know whether a Sendgrid IP is shared or dedicated? > > Use the FCrDNS data and one or another of the X-Spam-Relays metaheaders. > It should be possible to quickly refine these to "good enough", if > they're not already (watch for word wrap): > > header SENDGRID_SHARED_1 X-Spam-Relays-Untrusted =~ /^\[[^\]]+ > rdns=[\w\d.]+\.shared\.sendgrid\.net / > > header SENDGRID_SHARED_2 X-Spam-Relays-Untrusted =~ /^\[[^\]]+ > rdns=[\w\d.]+.outbound-mail.sendgrid.net / > > I suspect the second matches a somewhat different slice of their > services than you're asking about, but I can't say I can really tell the > difference from the outside. > > -kgd >
