T
TPauk
Guest
I have a Windows 2019 server running the SMTP role (IIS Manager). When I send email via telnet, all email gets processed and sent within seconds except to this one specific domain. Those emails get put in the mailroot/queue folder immediately and they stay there anywhere from 15 minutes to 6 hours. 95% are delivered delayed, but a few we have gotten an NDR for (must have exceed the max retry). I just cant seem to figure it out. We put our SMTP server IP address in our SPF record, and we are even using soft fail in the record too. Any other domain the mail gets sent (gmail, yahoo, outlo
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