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I checked your account's email history and I can see that the emails being sent to hemang_****_2000@******.com and firstname.lastname@example.org failed to send. These two addresses were added to the bounce list, which is why the emails kept failing. However, I have now removed these two email addresses from the bounce list so they should receive the next emails successfully.
You can also follow our guide here on How to Remove Your Email Address from Bounce List. Then to prevent further bouncing related issues, please follow our guide here: How to Prevent Email Bouncing Related Issues.