Why did my email delivery rate drop in Cyberimpact?
The Cyberimpact help pages give 4 common reasons. The first to rule out: Addresses that no longer exist or were never valid can bounce, as Cyberimpact explains, so a list with more of them delivers fewer emails.
Is it broken, or just quiet?
A number can fall because fewer people came, or because something stopped counting them. Below are the causes the Cyberimpact help pages give, and how to check each one yourself.
What causes it?
Addresses that no longer exist or were never valid can bounce, as Cyberimpact explains, so a list with more of them delivers fewer emails.
In the Cyberimpact help:
For example, this could happen if an email address does not exist or is invalid.
Incorrect addresses and technical problems, read 2026-11-12.If the sending domain's DMARC setup and the mailing do not line up, receiving servers can reject the emails, which Cyberimpact names as a cause of rejected mail.
In the Cyberimpact help:
When a DMARC policy is not respected, it can also cause emails to be rejected.
Incorrect addresses and technical problems, read 2026-11-12.Temporary delivery problems are retried for a few days, as Cyberimpact explains, so a mailing's delivered count can still move in the days after it goes out.
In the Cyberimpact help:
So, mailings statistics can change in the days after the mailing is sent.
Incorrect addresses and technical problems, read 2026-11-12.Addresses found to be incorrect are taken out of your groups on their own, so later mailings can go to fewer recipients.
In the Cyberimpact help:
Once detected as incorrect, these addresses are cleaned and automatically removed from your groups
Incorrect addresses and technical problems, read 2026-11-12.
How do I check it myself?
Look at where recent addresses came from and how they were collected, since Cyberimpact points to list quality first when delivery drops.
In the Cyberimpact help:
When your delivery rate drops, it is important to check the quality of your list and how you collect email addresses.
Mailing statistics, read 2026-11-12.Open the list of incorrect addresses for the mailing to see which contacts bounced and whether they share a source or domain.
In the Cyberimpact help:
In the Mailing performances section, click on the number of incorrect addresses to access the list of contacts.
Incorrect addresses and technical problems, read 2026-11-12.
How does Cyberimpact work with Feder?
- Connect Cyberimpact to Feder and it joins your Reach apps.
- When you connect Cyberimpact, Feder checks the connection straight away and shows Connected only when that check passes. If a reading cannot be taken later, Feder shows it as not read, never as zero.
Some numbers are too quiet to judge daily, such as a form filled in a few times a week. Until there is enough of your own history to judge a change, Feder says it is still learning and scores nothing, rather than guessing.
See whether you can trust the numbers in Cyberimpact, one of your Reach apps. Feder only reads. It never changes anything in Cyberimpact.
What else goes wrong with these numbers?
- Why did my Cyberimpact contact count drop?Cyberimpact
- Why don't my Cyberimpact spam complaint numbers add up?Cyberimpact
- Why did Google Analytics stop collecting data?Google Analytics
- Why aren't my key events showing in Google Analytics?Google Analytics
- Why does Google Analytics show (not set)?Google Analytics
See every question.
Where do these answers come from?
Every cause and check on this page comes from the Cyberimpact help pages, quoted above with the date we read them. Last reviewed 2026-11-12. We read them again by 2027-11-12. If one changes, this page changes or comes down.