Why did my bounce rate jump in Loops?
The Loops help pages give 4 common reasons. The first to rule out: Sending to an old imported list can raise bounces, because stale addresses often no longer have a mailbox.
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 Loops help pages give, and how to check each one yourself.
What causes it?
Sending to an old imported list can raise bounces, because stale addresses often no longer have a mailbox.
In the Loops help:
Mailbox does not exist: stale addresses, often from old imported lists.
Reducing product email bounce rate, read 2026-11-12.Addresses with typos, often from spam signups on a form, can bounce because their domain does not exist.
In the Loops help:
Domain not found: typo-filled addresses, often from form spam.
Reducing product email bounce rate, read 2026-11-12.If your sending domain's DKIM or SPF records fail, mailbox providers can hold or drop your mail, and soft bounces can climb.
In the Loops help:
Even soft bounces climb when DKIM or SPF fail, because mailbox providers hold your mail longer or drop it.
Reducing product email bounce rate, read 2026-11-12.A new sending domain has no history yet, and Loops notes that such a domain can bounce more at first.
In the Loops help:
A brand-new sending domain with zero history will bounce more.
Reducing product email bounce rate, read 2026-11-12.
How do I check it myself?
Look at the failure reasons on the send with the high bounces, since they point to the cause.
In the Loops help:
When a send has unexpectedly high bounces, the specific failure reasons tell you where to focus:
Reducing product email bounce rate, read 2026-11-12.Check how many of the contacts you sent to have not opened anything in 60 days or more, since Loops treats them as a bounce risk.
In the Loops help:
If a contact has not opened anything in 60+ days, they are a bounce risk even if their address is technically valid.
Reducing product email bounce rate, read 2026-11-12.
How does Loops work with Feder?
- Connect Loops to Feder and it joins your Reach apps.
- When you connect Loops, 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 Loops, one of your Reach apps. Feder only reads. It never changes anything in Loops.
What else goes wrong with these numbers?
- Why did my Loops campaign reach fewer contacts than I expected?Loops
- Why did my email open rate drop in Loops?Loops
- 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 Loops 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.