Happy to chat offline about this. The mail they are attempting to send to eastex.net is exclusively going to one address. This address returned *550 5.1.1 <xx...@eastex.net <xx...@eastex.net>> is not a valid mailbox* on December 23rd, 2021. After we receive a response like that, we add the address to the sender's suppression list. This prevents future attempts from ever leaving our system. So mail to eastex.net from this sender *is *failing to deliver. But it is failing because mail to that address bounced and the address is now on the user's suppression list. The customer can simply remove the address from suppression, but if we receive that response again, it will be re-added to the suppression list and future attempts will be dropped.
Hope this helps. Ping me if offline if you have any questions. Luke On Thu, Jan 20, 2022 at 1:38 PM Atro Tossavainen via mailop < mailop@mailop.org> wrote: > > I’ve gotten the header from the successful test that our customer sent > to his Yahoo account, but the IP Addresses gathered there didn’t appear in > any of our servers logs either. > > Are they not either of the two you mentioned? > > -- > Atro Tossavainen, Chairman of the Board > Infinite Mho Oy, Helsinki, Finland > tel. +358-44-5000 600, http://www.infinitemho.fi/ > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop >
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