https://community.appian.com/discussions/f/process/21410/external-email-issueHi We are sending email with attachment to external email id using send email smart service. It was working fine and suddenly stopped working. We tried changing the sender option to &#39;Process initiator&#39; and &#39;Custom Sender&#39;. Now it is working foren-USTelligent Community 12https://community.appian.com/thread/83566?ContentTypeID=1Mon, 12 Jul 2021 15:53:29 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:d9ecaee7-c9c4-48ae-8c3c-52d4ea82537aChris<p>If Appian is not giving you an error, you will need to troubleshoot this at the email server level.&nbsp; Review logs there to determine if the issue is with outgoing email, or this could be incoming policies for the recipients as you note it works fine for some but not for all.&nbsp; Can you <em>confirm</em> if any of these are making their way to spam folders, etc?</p><div style="clear:both;"></div>