we have issue in sending email by using application from firstname.lastname@example.org(User Mailbox in exchange) to Distribution list. If we try to send email from email@example.com to individual address who present in DL are able to send the mails by using application server.
Also, we have enabled the sender authentication to DLs for not receiving external emails.
Note : If we send a normal mail from outlook to those DLs its working. but only we are not able to send by using the app server.
Is there any thing do i need to check in send Connector or Kindly suggest wat could be the issue.