External Company cannot send E-mails to our users using one of their applications they use to distribute, and send E-mails.
Hello Experts. We have Exchange 2010 Standard in our Environment. one of companies cannot send us E-mails using the application they use to distribute E-mails to groups. Users individually from that company can send us E-mails no problem, but when they do it through their application, it does not come through to us, does not show anywhere on or E-mail gateway, and they receive the attached bounce back. Please assist in troubleshooting and resolving this issue. Thanks in advance. test.jpg
For my understanding the other party is sending mail externally to your internal distribution groups?