Why did my bounces jump in Quentn?

What causes it?

1. An email can bounce when the recipient's inbox is full.

   In the Quentn help: The recipient's inbox is full. Email Status, read 2026-11-12.

2. An email can bounce when the recipient's email provider is unavailable when it is sent, for example during maintenance.

   In the Quentn help: The email provider was not available at the time of sending, e.g. due to maintenance work Email Status, read 2026-11-12.

3. An address with a problem in its domain, such as a typo after the @, can bounce.

   In the Quentn help: There is something wrong with the domain (the one behind the @) - again, a typo may be the cause of this. Email Status, read 2026-11-12.

4. Emails can be rejected when the sending domain has a bad reputation.

   In the Quentn help: The sender domain is rejected because of a bad reputation. Email Status, read 2026-11-12.

How do I check it myself?

1. Look at contacts marked as blocked to see whether they are spam, blocked or only temporarily blocked.

   In the Quentn help: Blocked contacts have a red background: spam, blocked and temporarily blocked Email Status, read 2026-11-12.

2. After an email cannot be delivered the first time, Quentn unblocks the address after a set wait, so check again later before treating those contacts as lost.

   In the Quentn help: If the email cannot be delivered the first time, Quentn will unblock the email address after 72 hours. Email Status, read 2026-11-12.

How does Quentn work with Feder?

• Connect Quentn to Feder and it joins your Interest apps.
• When you connect Quentn, 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 Quentn, one of your Interest apps. Feder only reads. It never changes anything in Quentn.

What else goes wrong with these numbers?

• Why did my contact growth drop in Quentn?Quentn
• Why didn't my Quentn contact growth rise after an import?Quentn
• 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 Quentn 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.