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Sudden increase of hard bounces

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Posted on by 10

Hi all!

We have worked hard on improving our data quality and managed to decrease our newsletter hard bounces significantly. 

However, when we sent out our latest newsletter (February 7th) we suddenly saw a large increase of hard bounces.

Most of the hard bounces seem to be either:

  • invalid-mailbox
  • inactive-mailbox

But it seems unlikely that so many would suddenly have this bounce reason (feels a little "out of nowhere").

I am wondering if there might be some other explanation as to why this happened? Has anyone experienced this before?

Thanks in advance! //Maria

  • Suggested answer
    Haig Liu Profile Picture
    Haig Liu Microsoft Employee on at
    RE: Sudden increase of hard bounces

    Hi MsMariaJo,

    This is the method provided in the official documentation: 

    https://learn.microsoft.com/en-us/dynamics365/marketing/fix-high-bounce-rate

    About how to clean automatically:

       

    In addition, email authentication issues can lead to hard bounced emails.

    Multiple email authentication protocols can be implemented to help prevent these bounces, such as DKIM, SPF, and DMARC.

  • Georgi A Profile Picture
    Georgi A 15 on at
    RE: Sudden increase of hard bounces

    We are experiencing a similar issue. On 30th of Jan, we sent out an email that generated 160 hard bounces / 96 soft bounces. On 9th of Feb, we approached the same segment and got 1476 hard bounces / 106 soft bounces. It does seem suspicious that this data set has degraded so quickly as it has never happened before. Any feedback would be greatly appreciated.

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