When you get multiple hard bounces, it can severely damage your deliverability, as your sender identity can be flagged by email servers if they think you are sending content repeatedly to random emails. This is why it is important to regularly manage your email list, so you don’t suffer from hard bounces.
In a way, a hard bounce acts like a hard credit search when you apply for credit like a loan. As opposed to a soft bounce (or soft credit search!), a hard bounce can’t be rectified, as the email address you attempt to send an email to will never actually get there in the end, as the email address and/or the server does not exist.
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