Replied off list. --Jaren
On Thu, Apr 15, 2021 at 1:09 AM Mark Fletcher via mailop <mailop@mailop.org> wrote: > Hello, > > We're getting this response when sending to att.com from 66.175.222.12 > and 66.175.222.108. This is a Proofpoint response, yes? I've looked up our > IP addresses on their site, and we are not being blocked. So maybe it's a > rate limit? I was unable to find a technical contact on their website. Is > there anyone here from there that could help? > > Thanks, > Mark > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop >
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