電子郵件回應範例

以下是幾則有效和無效的電子郵件回應訊息範例。

有效期間：multipart/alternative

電子郵件回應通常包含三個部分：

• text/plain：訊息的純文字版本。
• text/vnd.google.email-reaction+json：回應部分。
• text/html：郵件的 HTML 版本。

範例如下：

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: multipart/alternative;
        boundary="----=_Part_0_2012232625.1697791227635"

------=_Part_0_2012232625.1697791227635
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Text body content
------=_Part_0_2012232625.1697791227635
Content-Type: text/vnd.google.email-reaction+json; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

{"emoji":"=F0=9F=99=83","version":1}
------=_Part_0_2012232625.1697791227635
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<h1>HTML body content</h1>
------=_Part_0_2012232625.1697791227635--

單一有效身體部位

電子郵件回覆也可以只包含單一身體部位，例如：

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: text/vnd.google.email-reaction+json; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

{"emoji":"=F0=9F=99=83","version":1}

請注意，Content-Transfer-Encoding 可以是任何標準編碼：

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: text/vnd.google.email-reaction+json
Content-Transfer-Encoding: base64

ewogICJlbW9qaSI6ICLwn46JIiwKICAidmVyc2lvbiI6IDEKfQ==

如果是二進位編碼 (例如 base64)，JSON 必須以 UTF-8 編碼。

在 multipart/related 中有效的巢狀 multipart/alternative

如果回覆的郵件含有內嵌附件，可以產生含有 multipart/related 主體部分的郵件，其中包含附件和 multipart/alternative 部分，如上一個範例所示。

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: multipart/related;
        boundary="----=_Part_0_2012232625.1697793303618"

------=_Part_0_2012232625.1697793303618
Content-Type: multipart/alternative;
        boundary="----=_Part_1_984213526.1697793303621"

------=_Part_1_984213526.1697793303621
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Text body content
------=_Part_1_984213526.1697793303621
Content-Type: text/vnd.google.email-reaction+json
Content-Transfer-Encoding: base64

ewogICJlbW9qaSI6ICLwn46JIiwKICAidmVyc2lvbiI6IDEKfQ==
------=_Part_1_984213526.1697793303621
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<h1>HTML body content</h1>
------=_Part_1_984213526.1697793303621--

------=_Part_0_2012232625.1697793303618
Content-Type: image/png
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="1x1.png"

iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAACnej3aAAAAAXRSTlMA
QObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=
------=_Part_0_2012232625.1697793303618--

(請注意，multipart/related 郵件內文部分應包含 RFC2387 指定的其他欄位，但這些欄位與判斷電子郵件回覆是否有效無關)。

「JSON」格式無效

下列反應無效，因為 JSON 缺少右大括號：

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: text/vnd.google.email-reaction+json; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

{"emoji":"=F0=9F=99=83","version":1

以下反應無效，因為 JSON 含有結尾逗號：

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: text/vnd.google.email-reaction+json; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

{"emoji":"=F0=9F=99=83","version":1,}

「version」欄位無效

下列回應無效，因為缺少 version 欄位：

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: text/vnd.google.email-reaction+json; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

{"emoji":"=F0=9F=99=83"}

下列反應無效，因為 version 欄位不是 1：

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: text/vnd.google.email-reaction+json; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

{"emoji":"=F0=9F=99=83","version":2}

「emoji」欄位無效

下列回應無效，因為 emoji 欄位空白：

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: text/vnd.google.email-reaction+json; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

{"emoji":"","version":1}

以下回應無效，因為 emoji 欄位未包含有效表情符號。

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: text/vnd.google.email-reaction+json; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

{"emoji":"A","version":1}

以下反應無效，因為兩個零寬度連字元 (ZWJ) 之間缺少愛心表情符號。請注意，第一行內容結尾的 = 字元代表 Quoted-Printable 編碼中的軟換行。

From: [e-mail]
Message-ID: <[e-mail]>
Subject: subject
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: text/vnd.google.email-reaction+json; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

{"emoji":"=F0=9F=91=A9=F0=9F=8F=BC=E2=80=8D=E2=80=8D=F0=9F=91=A8=F0=9F=8F=BE",=
"version":1}