Returns a paginated list of conversations across the workspace's mailboxes, most recently active first. `label` selects the view: the inbox (the default when omitted), `archive`, `spam`, `blocked`, or any custom label. Filter by mailbox, linked contact, or last-activity time, or pass `q` to full-text search conversations by their messages' subject and text. Conversations whose every message has been trashed are omitted; restoring a message returns its conversation to the list. `before` and `after` filter by time; to page through results pass the response cursors back as `starting_after` or `ending_before`. Filter to conversations in a specific mailbox. Filter to conversations linked to a specific contact. Filter to conversations carrying this label. Repeat the parameter to require several — only conversations carrying every listed label match. A placement label selects a folder (`inbox`, `archive`, `spam`, `blocked`); a custom label matches conversations in any folder. Defaults to `inbox` when omitted. When `true`, only conversations with unread messages are returned. This filters on the conversation's unread state, so it combines with `label` — for example, unread conversations in the archive. (The `unread` label itself lives on messages, not conversations.) Conversations involving this address — matches the sender or any recipient, as a case-insensitive contains-match, so a full address or any fragment of one works. Conversations whose subject contains this text (case-insensitive). Filter to conversations whose most recent message is at or after this time. This is a time filter, not a cursor. Filter to conversations whose most recent message is at or before this time. This is a time filter, not a cursor. 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. Thread ID. Mailbox this conversation belongs to. Channel this conversation lives on. Always `email`. Contact linked to this conversation, or null when none is linked. Subject of the conversation, taken from its first message. Null when that message had no subject. Addresses that appear on the retained messages in this conversation, including the mailbox's own address. Number of retained messages in this conversation, both directions. Number of retained received messages that are still unread. Spam and blocked mail is not counted. When the most recent retained message in this conversation was received or sent. Direction of the most recent message — `inbound` for a received message, `outbound` for a sent one. Possible values: `inbound`, `outbound` Labels on this conversation. Exactly one system placement label is always present — `inbox`, `archive` (filed away, done for now), `spam` (the opening message failed sender authentication), or `blocked` (rejected by the mailbox's receive policy or rules) — set by the message that started the conversation. Move a conversation by updating its labels: add `spam` to file it as spam, add `archive` to clean it out of the inbox, and add `inbox` — or remove `spam`, `blocked`, or `archive` — to bring it back. An archived conversation returns to the inbox by itself when a new message arrives. Custom labels share the same list; a conversation carries at most 20. When the thread was created. When the thread last changed. Matched search fragments, keyed by the field that matched. Returned only by thread search; omitted when listing threads. Matched fragments from the conversation's subject. Matched fragments from a message's body text. 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`.