We're seeing a lot of our mail being deferred due to being listed on the Proofpoint blacklist. A typical response to MAIL FROM: 450 4.7.0 Deferred - see https://support.proofpoint.com/dnsbl-lookup.cgi?ip=66.111.4.237 The major site this is affecting delivery to is iCloud, but there are other smaller sites in our logs, so it's not only iCloud. This happens from time to time, but this time Proofpoint's lookup service says we're not being listed. We've tried cycling our outgoing IPs to known-good ones (we monitor many blacklists), but remote sites continue to defer our mail while the lookup service continues to say we're fine: https://support.proofpoint.com/dnsbl-lookup.cgi?ip=66.111.4.25 https://support.proofpoint.com/dnsbl-lookup.cgi?ip=66.111.4.26 https://support.proofpoint.com/dnsbl-lookup.cgi?ip=66.111.4.27 (and so on. I suspect the entire 66.111.4.0/24 range would produce the same results). Either we are listed, and the lookup service is wrong, or we're not listed and whatever internal lookup Proofpoint customers use is wrong. We haven't been able to get hold of anyone at Proofpoint - no obvious support service for non-customers and we haven't been able to get anyone on the phone. Does anyone have a contact they can put me in touch with? Cheers, Rob N FastMail Operations.
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