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sendmux
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Sendmux API
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Schema
Filter operations
Billing
3
Connection
1
Domain Filters
2
Domains
7
Emails
3
Inboxes
2
Mailbox API
52
post
/mailbox/attachment-uploads
Create a presigned mailbox attachment upload
post
/mailbox/attachments:upload
Upload a mailbox attachment
get
/mailbox/changes
Get mailbox changes
get
/mailbox/connection
Get Mailbox connection
get
/mailbox/drafts
List saved drafts
post
/mailbox/drafts
Create a saved draft
get
/mailbox/drafts/{draftId}
Read a saved draft
delete
/mailbox/drafts/{draftId}
Delete a saved draft
patch
/mailbox/drafts/{draftId}
Edit a saved draft
patch
/mailbox/drafts/{draftId}/schedule
Reschedule or cancel a saved draft send
post
/mailbox/drafts/{draftId}/send
Send a saved draft revision
get
/mailbox/events
Stream mailbox events
get
/mailbox/folders
List mailbox folders
post
/mailbox/folders
Create a mailbox folder
get
/mailbox/folders/{folder_id}
Get a mailbox folder
delete
/mailbox/folders/{folder_id}
Delete a mailbox folder
patch
/mailbox/folders/{folder_id}
Update a mailbox folder
get
/mailbox/folders/changes
Get folder changes
get
/mailbox/folders/query-changes
Get folder query changes
get
/mailbox/identities
List mailbox sender identities
get
/mailbox/identity
Get mailbox sender identity
patch
/mailbox/identity
Update mailbox sender identity
get
/mailbox/mailboxes
List granted mailboxes
get
/mailbox/me
Self-introspect the calling mailbox
get
/mailbox/messages
List mailbox messages
post
/mailbox/messages:batch-delete
Batch delete mailbox messages
post
/mailbox/messages:batch-get
Batch get mailbox messages
post
/mailbox/messages:batch-update
Batch update mailbox messages
get
/mailbox/messages/{message_id}
Get a mailbox message
delete
/mailbox/messages/{message_id}
Delete a mailbox message
patch
/mailbox/messages/{message_id}
Update mailbox message flags
get
/mailbox/messages/{message_id}/attachments/{attachment_id}
Download a message attachment
get
/mailbox/messages/{message_id}/attachments/{attachment_id}/text
Read attachment text
post
/mailbox/messages/{message_id}/attachments/{attachment_id}/text
Request attachment text
get
/mailbox/messages/{message_id}/body
Get raw message body
get
/mailbox/messages/{message_id}/content
Get clean message content
get
/mailbox/messages/{message_id}/raw
Download the original message
get
/mailbox/messages/count
Count mailbox messages
get
/mailbox/messages/query-changes
Get message query changes
get
/mailbox/messages/search-snippets
Get message search snippets
post
/mailbox/messages/send
Send a mailbox message
get
/mailbox/quotas
List mailbox quotas
get
/mailbox/quotas/changes
Get quota changes
get
/mailbox/session
Get mailbox API session
get
/mailbox/submissions
List mailbox submissions
get
/mailbox/submissions/{submission_id}
Get a mailbox submission
get
/mailbox/submissions/changes
Get submission changes
get
/mailbox/threads
List mailbox threads
get
/mailbox/threads/{thread_id}
Get a mailbox thread
get
/mailbox/threads/{thread_id}/content
Get clean thread content
get
/mailbox/threads/{thread_id}/messages
List thread messages
get
/mailbox/usage
Get mailbox usage
Mailbox Filters
2
Mailboxes
13
Sending accounts
15
Webhooks
9
Mailbox API
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Changes to List granted mailboxes
get
/mailbox/mailboxes
Sep 9, 2026
7807ce923952
Revision changes
info
the endpoint scheme security
oauth2
was added to the API
Jun 11, 2026
a78515ef356b
Revision changes
info
endpoint added