Forward Thread Email
Forward a message in an inbox thread to new recipients.
POST
Forwards from the inbox address.
to is required. The original message is
quoted under a forwarded-message banner, and its attachments are included.
Files in attachments are sent along with those. Both count toward the 25MB
of content. An original attachment that was sent as a URL cannot be forwarded.
The forward carries the same In-Reply-To and References headers as a
reply to the original message, so
mail clients may group it with the original conversation. These headers can’t
be set or overridden.
Path Parameters
Body Parameters
string | string[]
required
Recipient email address. For multiple addresses, send as an array of strings.
to, cc, and bcc combined cannot exceed 50 recipients.string | string[]
CC recipient email address. For multiple addresses, send as an array of
strings. Counts toward the 50-recipient limit with
to.string | string[]
BCC recipient email address. For multiple addresses, send as an array of
strings. Counts toward the 50-recipient limit with
to.string
An HTML note sent above the quoted original.
string
A plain-text note sent above the quoted original.
string
The subject of the forward. When omitted, the thread subject is used, prefixed
with
Fwd: if it isn’t already. Max 2000 characters.array
Filename and content of attachments (max 25MB of content per message). A
path is fetched when the email is sent and does not count toward that limit.See examplesobject
Custom headers to add to the email.
In-Reply-To, References, and
Reply-To can’t be set and return 422.Headers
string
Add an idempotency key to prevent duplicated emails.
- Should be unique per API request
- Idempotency keys expire after 24 hours
- Have a maximum length of 256 characters
Response Fields
string
The ID of the queued outbound email.