For some reason, you may not be seeing my attachments. Let me inline them. I pasted the "sent-mail" below as well as the bounce message. I also looked up unumhumbrewing.com via mxtoolbox.com and it looks fine. You could also try sending a test email message to http://dummy.us.eu.org/noelleg yourself to see the bounce message. Thanks. > From: http://www.sontec.sontrak.net/~support > Date: Thu, 27 May 2021 14:51:45 -0700 > > Hi, > > Thank you for providing this information. Unfortunately we are not seeing > domain referencing unumhumbrewing.com in the info you provided. We also > do not see any indication of an email bring sent to that domain in our > logs. Could you please revert your setting back to Sonics SMTP settings > and make a few attempts to send an email to the intended recipient and > then send us the header information from those tests and bounce backs? > > Thank you, > > Josh D. > Technical Support Representative. > > http://www.sonic.net/~support Sonic. > Sonic. Support 2260 Apollo Way > 1.855.394.0100 (Tech Support) Santa Rosa, CA 95407 > 1.707.547.2199 (FAX) http://sonic.com/support > 1.707.800.4624 (Text Support) > > Request a call back, > https://www.sonic.com/support_cba_request?queue=TECHNICAL_SUPPORT