Hi @Parvind
Thank you for reaching out.
I had a look with the team and the reason you see this error is that these two email addresses have hard bounced with the following error that was returned from your server towards mid May: 550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient’s email address for typos or 550-5.1.1 unnecessary spaces. Learn more at 550 5.1.1
This often happens when the profesionnal email addresses have started being used before the IT team completely activate them - if you can send me proof (screenshots) of these two emails being used (screenshot of emails sent from those adresses for example) I can see with the team to unbounce them
Thank you
Best
Tiphaine