Email outbox
View the status of emails that are queued to be sent.
Available on all plans.
Available for all workspace members.
Email sending limits depend on your Attio plan.
From the Outbox page, you can manage queued emails that are scheduled to be sent from email accounts you have synced. You can also view emails that failed to send. Attio automatically spaces out email sends to protect your deliverability.
Email sending limits
For each synced mailbox, a maximum of 12 emails can be sent per hour, and a maximum of 200 per day, based on a rolling 24 hour period. These limits include one-off emails, mass sending, and sequences.
Attio waits five minutes between each email sent from a specific mailbox when sending mass emails or sequence emails, but not for one-off emails. Emails that are queued show on the Outbox page.
Email sequences are not intended to be used for high volume outreach. Only 1,000 emails can be scheduled at a time across the workspace. Additional queued emails remain unscheduled until earlier emails are sent or canceled. Learn more about sequence use cases.
Email sending limits per batch and per month vary by plan:
Free plan: Mass send to up to 10 recipients at once, and send up to 200 emails per month per user
Plus plan: Mass send to up to 50 recipients at once, and send up to 1,000 emails per month per user
Pro and Enterprise plans: Mass send to up to 50 recipients at once, with no monthly user sending limit
Monthly limits include all types of emails sent: one-off, mass sending, and sequences. On plans with no monthly limit per user, the hourly and daily limits per mailbox still apply. Learn more about plans and pricing.
View the outbox
Navigate to the outbox by clicking Emails in the left-hand sidebar, then Outbox. Click an email in the outbox to preview it. You can see the sender, recipients, scheduled send time, and which sequence it belongs to if applicable.
Note: Your Outbox page will only show emails that are scheduled to be sent from an email account you have personally synced. Emails scheduled to be sent from mailboxes synced by other workspace members are not visible to you.
Emails are prioritized and queued according to the type of email, in the following order: single sends, then mass sends, then sequences.
Cancel outbox emails
You can cancel emails that are queued on your Outbox page to prevent them from being sent. You can only view and cancel emails that are being sent from email accounts you have personally synced to Attio.
Important: If you cancel an email that is part of a sequence, the recipient will also exit the sequence and will not receive any remaining emails in that sequence.
Cancel an individual email
To cancel a single email from the Outbox page:
Open the email you want to cancel.
Click the ⋮ icon.
Click Cancel email.
Cancel all emails
To cancel all emails currently shown on your Outbox page:
Click Cancel all emails in the top right.
Confirm by clicking Cancel emails.
View failed emails
When Attio can't send an email, it appears on the Failed page along with the reason it failed.
To view failed emails, click Emails in the sidebar, then Failed. Select an email to see its recipients, when it was sent, and why it failed.
The Failed page shows one-off and mass emails sent from your synced mailboxes, including emails you sent with Ask Attio. You only see failures from mailboxes you’ve connected yourself.
Emails sent as part of a sequence don’t appear here. To check whether a sequence email was sent, open the sequence and review the status of each recipient.
Why emails fail to send
The failure reason can help you work out what to do next. Failures generally relate to your connected account, your email provider, or the email you tried to send.
Problems with your connected account
If you see any of these messages, reconnect the account from Account settings, then send the email again.
The connected email account was disconnected: Attio no longer has access to the mailbox, often after a password or security setting changed.
The connected email account could not be accessed: Attio couldn't reach the account when it tried to send.
Failed to find this email instance's mailbox email address: Attio couldn't identify which address to send from.
Problems at your email provider
These failures happen while Attio is communicating with your email provider. They may be temporary. Wait a few minutes and try sending the email again.
The email provider could not be reached: Attio couldn't connect to Gmail or Microsoft 365.
The email provider's rate limit was reached: You've hit a sending limit set by your provider.
The email provider rejected the request: Your provider refused the message.
Max delivery attempts exceeded: Attio retried the send and gave up.
The email could not be delivered: The send didn't complete.
Problems with the email itself
These failures relate to the email Attio was trying to send. Check the failure reason, then create a new draft and try again.
The email has no recipients: No valid recipient address was attached to the email.
The email could not be prepared for sending: Attio couldn't assemble the message.
The email being replied to could not be loaded: You replied to a message that Attio could no longer load from your provider, usually because it was deleted from the mailbox in the meantime.
What happens when a send fails
Some problems are temporary, such as a rate limit from your email provider. Attio retries these automatically, up to seven times, with a longer gap between each attempt, over roughly an hour. Most clear on their own and the email sends without you doing anything.
Other problems can't be fixed by trying again, such as an email with no recipients. Attio doesn't retry these and the email moves to the Failed page right away.
Once an email appears on the Failed page, Attio has stopped trying to send it. Failed emails are read-only and can’t be resent from this page. Resolve the failure if needed, then compose and send a new email.
Reduce outbox queue
Each synced mailbox has its own sending limits. You can reduce the number of queued emails by syncing multiple mailboxes to your Attio account (available on Pro and Enterprise plans) and switching between them when sending emails. For example, you can use one mailbox for sequences and another for one-off emails.
Note: Each workspace member can sync two mailboxes (email and calendar accounts) on the Pro plan, and can sync unlimited mailboxes on the Enterprise plan. Learn more about plans and pricing.