Why are fewer of my Apollo sequence emails being delivered?
The Apollo help pages give 5 common reasons. The first to rule out: Sequence emails only go out inside the days and hours of their schedule, so a quiet day can be a day the schedule does not cover.
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?
Sequence emails only go out inside the days and hours of their schedule, so a quiet day can be a day the schedule does not cover.
In the Apollo help:
Automatic emails wait for an allowed sending window after their wait time ends.
Configure a Sequence Sending Schedule, read 2026-11-12.If a linked mailbox's sign-in stops working, for example after a password change, Apollo can remove it and its emails stop going out.
In the Apollo help:
If Apollo can't authenticate your email account's login credentials, Apollo removes the mailbox.
Link Your Mailbox to Apollo, read 2026-11-12.Your email provider's limits and the limits you set in Apollo can both cap how many emails go out in a day.
In the Apollo help:
Sending limits may be set by your email provider, but you also set Apollo-specific email sending limits.
Email Deliverability Best Practices, read 2026-11-12.Emails from a domain without proper authentication records can be labeled as spam rather than reaching the inbox.
In the Apollo help:
When you don't properly configure DNS records like SPF, DMARC, and DKIM, your emails are at risk of being labeled as spam.
Troubleshoot Domain Authentication, read 2026-11-12.A sequence can stop emailing a contact once they reply, so a week with many replies can mean fewer later emails.
In the Apollo help:
Mark contact as finished in sequence when there is a reply.
Manage Sequence Rulesets, read 2026-11-12.
How do I check it myself?
Check the time zone on your sequence schedule. It decides which day an email goes out on.
In the Apollo help:
Your selected time zone controls when automatic emails send.
Configure a Sequence Sending Schedule, read 2026-11-12.If your schedule follows each contact's time zone, emails to contacts with no known time zone follow the schedule's own time zone instead.
In the Apollo help:
When Apollo can't identify the contact's time zone, Apollo uses the time zone selected for the schedule.
Configure a Sequence Sending Schedule, 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 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 my Apollo emails not sending?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.