If you have scheduled an email or a campaign to be sent, but decided to cancel or reschedule the email then you have several options.
If you are looking for information on how to stop a send that is currently in progress, click here!
There is a group of endpoints in the SendGrid API v3 that makes it possible to batch transactional email together and to schedule a time for that batch to be delivered. You can also pause or cancel the delivery of one of these batches.
You can have no more than 100 different batches (100 different groups of emails with each group identified by a unique batch_id) in a 'paused' or 'pending cancellation' state at one time.
To create a batch ID, assign that ID to an email or group of emails, and cancel the send, refer to the following steps:
First, generate a batch id by calling the v3/mail/batch endpoint. When successful, you should receive a 201 response along with your batch ID.
POST https://api.sendgrid.com/v3/mail/batch
_10HTTP/1.1 201_10 {_10 "batch_id": "YOUR_BATCH_ID"_10 }
The batch ID generated in step 1 can now be used when scheduling an email via the SendGrid API v3 by setting the value of batch_id to your new batch ID in a v3/mail/send request and setting the value of send_at to a UNIX timestamp representing the time you want your email sent. For example:
POST https://api.sendgrid.com/v3/mail/send
_23{_23 "personalizations": [_23 {_23 "to": [_23 {_23 "email": "john@example.com"_23 }_23 ],_23 "subject": "Hello, World!"_23 }_23 ],_23 "from": {_23 "email": "from_address@example.com"_23 },_23 "content": [_23 {_23 "type": "text/plain",_23 "value": "Hello, World!"_23 }_23 ],_23 "send_at": 1484913600,_23 "batch_id": "YOUR_BATCH_ID"_23}
_10{_10 HTTP/1.1 202_10}
If you have the flexibility, it's better to schedule mail for off-peak times. Most emails are scheduled and sent at the top of the hour or half hour. Scheduling email to avoid those times (for example, scheduling at 10:53) can result in lower deferral rates because it won't be going through our servers at the same times as everyone else's mail.
Now that your email has been scheduled and has a batch ID assigned, you can pause or cancel the send at any time up to 10 minutes before the scheduled send time.
Scheduled sends canceled less than 10 minutes before the scheduled time are not guaranteed to be canceled.
To only pause your scheduled send, set the status parameter in your request to "pause". To completely cancel your request, set status to "cancel".
When a Batch is canceled, all messages associated with that batch will stay in your sending queue, but when their send_at value is reached, they will be discarded instead of attempting delivery.
When a Batch is paused, all messages associated with that batch will stay in your sending queue, even past their send_at value. Any messages that are more than 72 hours old will be discarded as Expired.
POST https://api.sendgrid.com/v3/user/scheduled_sends
_10{_10 "batch_id": "YOUR_BATCH_ID",_10 "status": "pause"_10}
_10HTTP/1.1 201
For more details, please see our Cancel Scheduled Sends API Reference.
These directions refer to unscheduling a Single Send in the new Marketing Campaigns product.
If you scheduled a specific time to send your campaign, it's easy to unschedule this campaign to make changes or reschedule it. Simply navigate to your Campaigns page by clicking Marketing Campaigns in the left hand navigation menu and selecting Single Sends. Next to the Single Send you want to unschedule, click the action menu and select Unschedule.
These directions refer to unscheduling a Campaign in the legacy Marketing Campaigns product.
You can unschedule a campaign by making a call to /v3/campaigns/{campaign_id}/schedules where {campaign_id} is the ID of the campaign you want to unschedule. A successful unschedule will return a 204. You cannot unschedule campaigns that are already in the process of being sent. You should instead cancel or delete the campaign.
DELETE https://api.sendgrid.com/v3/campaigns/{campaign_id}/schedules
HTTP/1.1 204