Why did my Mailjet emails sent drop?
The Mailjet help pages give 5 common reasons. The first to rule out: Mailjet can hold back an email to an address that bounced permanently before, because it has little chance of arriving.
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 Mailjet help pages give, and how to check each one yourself.
What causes it?
Mailjet can hold back an email to an address that bounced permanently before, because it has little chance of arriving.
In the Mailjet help:
Hard Bounce History: The email address has previously resulted in a hard bounce.
Understanding Why Your Emails Are Blocked and How to Resolve It, read 2026-11-12.Mailjet can hold back an email to someone who reported your mail as spam.
In the Mailjet help:
Spam Report: A recipient reported your email as spam.
Understanding Why Your Emails Are Blocked and How to Resolve It, read 2026-11-12.A mistake in an email template can stop those emails from going out.
In the Mailjet help:
Templating Errors: Errors in the templating language can also cause emails to be blocked.
Understanding Why Your Emails Are Blocked and How to Resolve It, read 2026-11-12.Mailjet can slow an account's sending when its emails draw too many spam complaints.
In the Mailjet help:
If your emails generate an excessive number of spam complaints, a sending rate limit will be applied to your account.
Blocked or Limited Account: Reasons and How to Restore Full Functionality, read 2026-11-12.Emails from a sender address you have not validated can be held in a queue until you deal with it, and Mailjet tells you about it.
In the Mailjet help:
This automatically queues the emails and notifies you about the unknown address.
Unknown sender detection alert, read 2026-11-12.
How do I check it myself?
Look at blocked, bounced and retrying emails next to delivered ones for the same days to see where the missing emails went.
In the Mailjet help:
The rate percentages (delivered, blocked, bounced, retrying) are calculated over the total number of processed messages.
Campaign Stats & Dashboard, read 2026-11-12.Check that your Mailjet invoices are paid. Mailjet can restrict sending on an account with an overdue invoice.
In the Mailjet help:
If an invoice remains unpaid past its due date, your sending may be restricted, and services may be suspended.
Blocked or Limited Account: Reasons and How to Restore Full Functionality, read 2026-11-12.
How would I know the day it starts?
- Feder reads your emails sent from Mailjet each day and compares each day with your own history.
- It tells you when emails sent go quiet or move outside their usual range.
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 what Feder reads from Mailjet, which feeds Reach. Feder only reads. It never changes anything in Mailjet.
What else goes wrong with these numbers?
- Why did my Mailjet email clicks drop?Mailjet
- Why did my Mailjet emails sent suddenly jump?Mailjet
- 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 Mailjet 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.