Why are these email addresses considered invalid?

Why are these email addresses considered invalid?

Hello,

I have imported a list of over 1600 contacts. 53 of the imported contacts are now marked as Invalid. I would expect this if the addresses had a syntax issue or perhaps they have a typo in the suffix, but this does not appear to be the case with any of the email addresses in the list.

Can anyone explain what qualifies as an Invalid Email address and/or what may have occurred that prompted Zoho Campaigns to mark these email addresses as Invalid during import?

Thank you,
Richard
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