Why are my Apollo emails not sending?
The Apollo help pages give 5 common reasons. The first to rule out: If the sequence step an email belongs to is not active, that email does not go out.
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 Apollo help pages give, and how to check each one yourself.
What causes it?
If the sequence step an email belongs to is not active, that email does not go out.
In the Apollo help:
Ensure you activate the sequence step associated with the email you expect to send.
Troubleshoot Sending Emails, read 2026-11-12.Emails in a manual step wait for someone on your team to send them by hand.
In the Apollo help:
If you configure a manual email step in a sequence, the email won't send automatically.
Troubleshoot Sending Emails, read 2026-11-12.If a contact is missing a detail the email fills in for them, Apollo can hold that email back.
In the Apollo help:
If a contact is missing data for a snippet or dynamic variable, Apollo won't send the email.
Troubleshoot Sending Emails, read 2026-11-12.Apollo can hold back a first email to a contact whose address it has not yet confirmed, as a safety step.
In the Apollo help:
If it's your first time sending an email to a contact with an unverified email, Apollo won't send the email as a failsafe.
Troubleshoot Sending Emails, read 2026-11-12.Contacts who are paused in a sequence stop getting their scheduled emails until they are resumed.
In the Apollo help:
Pausing the selected contacts stops their scheduled outreach.
Manage Contacts in a Sequence, read 2026-11-12.
How do I check it myself?
Look at the not sent reason Apollo gives for each email that did not go out.
In the Apollo help:
Hover over the email status to see the not sent reason.
Troubleshoot Sending Emails, read 2026-11-12.If contacts seem to be missing from a sequence, check whether a status filter is hiding paused, finished, bounced or not sent contacts.
In the Apollo help:
A status filter may hide contacts that are paused, finished, bounced, or not sent.
Manage Contacts in a Sequence, read 2026-11-12.Fix the reason an email was not sent before you retry it, or Apollo can hold it back again.
In the Apollo help:
Be sure to resolve the underlying not-sent issue before retrying, or Apollo may block the send again.
Troubleshoot Sending Emails, read 2026-11-12.
How would I know the day it starts?
- Feder reads your outreach emails delivered from Apollo each day and compares each day with your own history.
- It does not read your sequence settings. It tells you when delivered outreach emails 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 Apollo, which feeds Reach. Feder only reads. It never changes anything in Apollo.
What else goes wrong with these numbers?
- Why are so many of my Apollo emails bouncing?Apollo
- Why are fewer of my Apollo sequence emails being delivered?Apollo
- 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 Apollo 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.