Returns the workspace's sent and scheduled messages, newest first, as a cursor page. Each item carries the aggregate delivery `status` and per-state recipient counts, not the message body. Combine filters to narrow the page: `status`, `category`, `tag`, exact `to`/`from` address, and a `created_after`/`created_before` time window. Maximum number of items to return per page. Cursor from the `next_cursor` field of a previous list response. Returns items immediately after the cursor position in the current sort order. Cursor from the `prev_cursor` field of a previous list response. Returns items immediately before the cursor position in the current sort order. Return only resources created strictly after this timestamp. RFC 3339 / ISO 8601 with timezone. Return only resources created strictly before this timestamp. RFC 3339 / ISO 8601 with timezone. Filter by aggregate delivery status. Filter by tag. Accepts `name` to match any message carrying that tag name, or `name:value` to match a specific tag pair (e.g. `category:welcome`). Repeat the parameter to AND-combine several tag filters. Filter by category. Filter by recipient address. Exact match against any `to`/`cc`/`bcc` recipient on the message; normalised to lowercase before comparison. Filter by sender address. Exact match against the message `from` field; normalised to lowercase before comparison. Page of message objects. Message ID. Sender address. `name` is present when a display name was provided on the send. Email address. Display name shown alongside the address in mail clients. Primary recipients. Length is the recipient count; use the broadcasts endpoint for audience-targeted sends. Each entry's `name` is present when a display name was provided on the send. Email address. Display name shown alongside the address in mail clients. CC recipients. Email address. Display name shown alongside the address in mail clients. BCC recipients. Email address. Display name shown alongside the address in mail clients. Message subject line. Content classification. Controls suppression policy — `marketing` blocks on all suppression reasons; `transactional` allows delivery through complaint and unsubscribe suppressions. Possible values: `marketing`, `transactional` Reply-To addresses, if set on the send. Empty/null when no Reply-To was provided. Aggregate delivery status derived from recipient states. `scheduled` means the message is queued to send at a future time and has not been dispatched yet. `accepted` means Bird has the send and is preparing to deliver. `processed` means Bird has processed the message and queued it for delivery to the recipient's mail server. `canceled` means a scheduled message was canceled before it was sent. Number of recipients currently in the `accepted` state — Bird has the send and is preparing to deliver. Number of recipients for whom Bird has processed the message and queued it for delivery. Number of recipients whose messages were accepted by the remote MTA. Number of recipients that resulted in a permanent delivery failure. Number of recipients that reported spam. Number of recipients in transient delivery deferral; the provider is retrying. Number of recipients rejected before delivery. See the per-recipient `rejection_reason` field on `GET /v1/email/messages/{message_id}/recipients` for the specific cause (suppression match, transmission failure, generation failure, or policy refusal). Time between Bird accepting the send and the message being processed for delivery, in milliseconds, for the fastest recipient. Null until the first recipient reaches `processed`. Time between the message being processed and the receiving mail server accepting it, in milliseconds, for the fastest delivered recipient. Null until the first recipient is delivered. End-to-end accept → delivered time for the fastest delivered recipient, in milliseconds. Null until the first recipient is delivered. Total open events across all recipients. Total click events across all recipients. Structured `{name, value}` filter labels applied to this send. See EmailMessageSendRequest for the tags vs metadata distinction. Tag name. ASCII letters, digits, underscore, and hyphen only. Case-sensitive. Maximum 32 characters. Tag value. ASCII letters, digits, underscore, and hyphen only. Case-sensitive. Maximum 64 characters. Arbitrary JSON metadata stored on the message object and echoed in webhook payloads. See EmailMessageSendRequest for the tags vs metadata distinction. Attachment metadata for the send. Empty when no attachments were included. Raw content is not echoed; when content storage is enabled, download an attachment by its `id` via the message's attachment endpoint. Attachment ID, stable per email send. Filename as shown to the recipient. Resolved MIME type at send time. Decoded size in bytes. True when the attachment was sent inline via a `content_id` reference in the HTML body, false for regular file attachments. The Content-ID set at send time, when the attachment was inline. Whether open tracking is enabled for this send. Whether click tracking is enabled for this send. When the send request was accepted. Thread this message belongs to. Null until threading is enabled. The message this one is a reply to, if any. When all recipients reached a terminal delivered state, or null if not yet fully delivered. When this message is scheduled to send, for a send created with a future send time. Null for an immediate send. Stays set after the scheduled send fires. Cursor for the next page. Pass back as `starting_after` to advance forward. Null when no next page exists. Cursor for the previous page. Pass back as `ending_before` to step backward. Null when no previous page exists. Refresh anchor. Pass back as `ending_before` later to fetch items that have appeared since this response. Non-null whenever `data` is non-empty; null only on an empty page. Distinct from `prev_cursor`.