Why did my SendGrid delivered emails drop?
The Twilio SendGrid help pages give 5 common reasons. The first to rule out: Emails to people who unsubscribed are dropped by SendGrid and never sent, so they are not delivered.
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 Twilio SendGrid help pages give, and how to check each one yourself.
What causes it?
Emails to people who unsubscribed are dropped by SendGrid and never sent, so they are not delivered.
In the Twilio SendGrid help:
If a recipient unsubscribed from your emails, Twilio SendGrid drops the message.
Event Webhook Reference, read 2026-11-12.A bounce means the recipient's email server will not take mail for that address, so the email is not delivered.
In the Twilio SendGrid help:
The receiving server doesn't accept mail sent to this recipient.
Event Webhook Reference, read 2026-11-12.A blocked email was turned away by the recipient's server for now, so it is not counted as delivered.
In the Twilio SendGrid help:
The receiving server can't accept the message at this time.
Event Webhook Reference, read 2026-11-12.A deferred email was put off for now by the recipient's server. It is not delivered yet, which can make today's delivered count lower.
In the Twilio SendGrid help:
The receiving server rejected the message temporarily.
Event Webhook Reference, read 2026-11-12.Receiving servers can slow down how much mail they take from you based on your sending reputation, so fewer emails get through at once.
In the Twilio SendGrid help:
Your IP may be throttled for reputation reasons.
Troubleshooting Email Delivery Deferrals and Server Retry Delays, read 2026-11-12.
How do I check it myself?
Read delivered as accepted by the recipient's email server. It does not tell you whether the email reached the inbox or the spam folder.
In the Twilio SendGrid help:
Twilio SendGrid succeeded in delivering the message to the receiving server.
Event Webhook Reference, read 2026-11-12.A few deferred emails are normal. Look for a rise in deferrals compared with your usual level rather than reacting to any single one.
In the Twilio SendGrid help:
A deferral doesn’t necessarily mean that something went wrong; all senders receive deferrals.
Troubleshooting Email Delivery Deferrals and Server Retry Delays, read 2026-11-12.Look up individual messages in SendGrid's email activity to see each step, so you can tell whether they were dropped, bounced, blocked or deferred.
In the Twilio SendGrid help:
As each entry shows the full delivery flow of the message, this helps you identify delivery issues.
Email Activity Feed, read 2026-11-12.
How would I know the day it starts?
- Feder reads the emails SendGrid delivered each day and compares each day with your own history.
- If deliveries go quiet or move outside your usual range, Feder tells you.
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 SendGrid, which feeds Reach. Feder only reads. It never changes anything in SendGrid.
What else goes wrong with these numbers?
- Why does SendGrid show fewer delivered emails than I sent?Twilio SendGrid
- Why aren't my new SendGrid contacts showing up?Twilio SendGrid
- 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 Twilio SendGrid 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.