如何用Kotlin+Microsoft Graph API V6替换V5代码实现邮件发送

报错原因 #

你遇到的/me request is only valid with delegated authentication flow报错，是因为当前使用Client Secret应用权限认证，而/me接口仅支持**委托权限（用户登录）**场景。要实现从指定发件人发送邮件，需要直接指定用户ID或邮箱调用接口。

V6替代实现代码 #

替换你原来的graphClient.me().sendMail()调用，改用指定用户的方式发送，完整代码如下：

val clientId = ""
val tenantId = ""
val clientSecret = ""

val scopes = arrayOf("https://graph.microsoft.com/.default")

val credential = ClientSecretCredentialBuilder()
    .clientId(clientId)
    .tenantId(tenantId)
    .clientSecret(clientSecret)
    .build() ?: throw Exception("Failed to create credential")

val graphClient = GraphServiceClient(credential, *scopes)

// 准备邮件消息（这部分和你原代码一致）
val message = Message()
message.subject = "Meet for lunch?"
val body = ItemBody()
body.contentType = BodyType.Html
body.content = "The new cafeteria is open."
message.body = body

val toRecipients = LinkedList<Recipient>()
val toRecipient = Recipient()
val toEmailAddress = EmailAddress()
toEmailAddress.address = "frannis@contoso.com"
toRecipient.emailAddress = toEmailAddress
toRecipients.add(toRecipient)
message.toRecipients = toRecipients

val ccRecipients = LinkedList<Recipient>()
val ccRecipient = Recipient()
val ccEmailAddress = EmailAddress()
ccEmailAddress.address = "danas@contoso.com"
ccRecipient.emailAddress = ccEmailAddress
ccRecipients.add(ccRecipient)
message.ccRecipients = ccRecipients

// 创建SendMail请求体
val sendMailPostRequestBody = SendMailPostRequestBody()
sendMailPostRequestBody.message = message
sendMailPostRequestBody.saveToSentItems = true // 和V5一致，保存到已发送邮件

val emailSender = "sender365@contoso.com"

// V6核心发送逻辑（替代V5的users(it).sendMail部分）
emailSender?.let { sender ->
    graphClient.users()
        .byUserId(sender) // 指定发件人邮箱或用户ID
        .sendMail()
        .post(sendMailPostRequestBody)
}

关键注意事项 #

• 权限配置：确保Azure AD应用已添加Mail.Send应用权限，并完成管理员同意。
• 发件人合法性：指定的emailSender必须是当前租户内的有效用户邮箱，且应用有权限操作该用户的邮箱资源。

内容的提问来源于stack exchange，提问作者Abneco