Co pilot - how to prevent hard bounces

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We have been sending mail campaigns successfully. Then, all of the sudden, for no apparent reason, we received hard bounced errors for 3 contacts and from then on, we have not been able to send out emails to them.

We thought we were blocked by their SMTP servers but we just found out that there were black listed at GS end. When mail hard bounces, the admin has to run the email validator, type in each email address to correct it.

For all of them, we confirmed they were blacklisted for the following reason: 554 Blocked

and we are referred to a link in where we can read the following with Q&As

About Proofpoint Dynamic Reputation (PDRTM) and steps you can take if your IP is being delayed or blockedProofpoint Dynamic Reputation leverages Proofpoint's world class, machine-learning driven content classification system to determine which IPs may be compromised to send spam (i.e. as part of a botnet). We understand that different companies and different people have varying ideas of what 'spam' is. We take a stance that it is better not to block some messages (spam) than delay or block legitimate email that our customers are expecting - this policy is an extension from our content classification system. The goal with IP reputation is to delay or block IPs that have been identified as being part of a botnet or under the control of spammers.

Why, at the sending end, are is the contact blacklisted?

How can we prevent this rather than correct it?
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Diane Morneau

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  • puzzled about why this manual work is imposed on admins

Posted 1 year ago

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Abhishek Sivaraman, Senior Product Manager

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Hi Diane,

When the email is blacklisted, we err on the safe side and we block and filter out the emails for which we got a hard bounce. This is because every time you hard bounce an email it hurts your sending reputation a little bit. A great deal of hard bounces can jeopardize the deliverability of contacts that are not invalid, and want your email. 

Hope this helps!

Abhishek S
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Ben, Champion

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This is a pretty robust question with lots of ins, outs, and what have yous. But, I did want to pass on this helpful KB:

I have tried to build our outreaches to stay in line with this model, and it's been (mostly) successful.