邮件 API 精选清单
Choose the right email API for your workload
Deliver transactional emails, run marketing campaigns, and manage AI agent mailboxes from one platform. Ship and operate email workflows through the REST API, SDKs, CLI, and Bird MCP.
This shortlist matches each provider to the workload it fits best and spells out the trade-offs before you integrate. Every pricing table compares published rates side by side and separates a spendable Bird balance from fixed monthly send allowances.
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哪个邮件 API 适合你的应用？
Choose Bird when you want transactional delivery, marketing broadcasts, and conversational agent inboxes in a single account. Use the table below to see where other providers fit specific workloads. These recommendations reflect documented product capabilities rather than inbox-placement rankings.
| 服务商 | 适用场景 | 选择前需确认 |
|---|---|---|
| Bird | Transactional email, marketing campaigns, and agent mailboxes in one workspace, complete with reusable templates, audience targeting, threaded replies, and inbound sender rules. | Plan how you will map message streams and suppressions when migrating an existing app, since Bird’s message category tags traffic rather than isolating infrastructure. Review the idempotent retry window and single-address email lookup guide. |
| Resend | React Email templates rendered and sent directly from the Node SDK. | Dedicated IPs require the Scale plan and an add-on, while managed IP pools scale dynamically without exposing the underlying IP addresses. |
| Postmark | Message Streams that keep transactional receipts and broadcast traffic on separate IP ranges. | Safe send retries require your own deduplication logic: Postmark does not support request idempotency keys and recommends combining status-code checks with delivery webhooks. |
| Mailgun | Inbound Routes that filter incoming emails and forward or store matching messages. | Mailgun’s Inbox Placement test key prevents duplicate seed tests rather than deduplicating customer email retries. |
| Amazon SES | Applications already running on AWS that manage email sending, verified identities, configuration sets, and suppression lists through IAM and the AWS CLI. | AWS pricing bills send volume, account tiers, attachment data transfer, and optional add-ons separately instead of bundling a monthly send allowance. |
| SendGrid | Subusers that isolate sending domains, analytics, team permissions, and credit limits under a parent account. | Inbound Parse posts incoming mail and attachments to your webhook URL, leaving thread state and message storage up to your application. |
| MailerSend | Hosted MCP tools and a CLI for sending email and SMS and managing domains, templates, and recipients. | Dedicated IPs are gated by monthly sending volume and manual review on qualifying plans. |
| Brevo | MCP tools for managing CRM contacts, marketing campaigns, templates, and domains. | Batch retry protection covers the entire multi-version batch request at once and expires after 30 minutes. |
Bird、AgentMail 和 Nylas 在邮箱状态方面有何区别？
All three products provision hosted inboxes that store incoming messages and track reply threads for software and AI agents. The Nylas column covers Agent Accounts, which give an autonomous agent its own mailbox without OAuth access to an employee inbox.
| 邮箱需求 | Bird | AgentMail 和 Nylas Agent Accounts |
|---|---|---|
| 解析后的 webhook | The inbound mail webhook delivers mailbox, thread, and message identifiers alongside sender details, recipients, and quote-stripped reply text with a flag when long bodies are truncated. | AgentMail: Inbound mail events include message and thread payloads, though plain-text and HTML availability depends on what the sender transmitted. Nylas: Inbound notifications announce newly stored mail, and large payloads omit the body so your app fetches the full message via the API. |
| 存储内容 | Stored mailbox messages retain headers, extracted reply text, and attachments so agents can read context on demand, while full bodies and inbound raw MIME follow configurable retention windows. | AgentMail: Message retrieval returns stored content and reply text stripped of quoted history, with separate calls for raw MIME and attachments. Nylas: Agent Account mailboxes organize stored messages in folders under policy-defined storage and retention limits. |
| 地址配置 | Provision a mailbox in one call on a generated address for instant testing, or bind it to your own receiving-enabled custom domain. | AgentMail: Create an inbox on the default domain or a verified custom domain, with optional auto-generated usernames. Nylas: Provision a hosted Agent Account via the API or CLI without user OAuth on either a custom domain or a Nylas trial domain. |
| 会话与回复状态 | Conversation threads track participants and unread counts automatically: replying appends to the existing thread while composing starts a new conversation. | AgentMail: Reply actions keep outbound responses inside the same retrievable thread. Nylas: Threaded replies set standard reply headers automatically and attach the sent message to the active Agent Account thread. |
| 发件人规则 | Receive policies and sender rules restrict an inbox to existing threads or approved senders. Blocked messages stay inspectable in a separate folder without triggering webhooks or agent runs, or can be dropped outright. | AgentMail: Allow and block lists filter outbound sends, new inbound mail, and replies at the organization, pod, or inbox level. Nylas: Workspace rules govern inbound and outbound mail separately and reject blocked senders during the SMTP handshake before storage. |
| 代理操作 | CLI commands and MCP tools let agents create mailboxes, read conversation threads, and send replies, while mailbox management APIs configure receive policies and sender allowlists. | AgentMail: Hosted MCP tools create inboxes, read threads, send messages, and reply. Nylas: Agent Account CLI and API workflows provision accounts, send mail, and read replies using an account grant identifier. |
Bird 的优势在哪里？
Bird pairs its own MTA and IP-reputation network with campaign management and programmable agent inboxes. Engineering and growth teams work from the same REST API, SDKs, CLI, and MCP tools rather than stitching together separate transactional, marketing, and inbound vendors.
| 能力 | Bird 的优势 | 评估要点 |
|---|---|---|
| 邮件送达能力积淀 | Bird acquired SparkPost in 2021, and its sending network delivers roughly 40% of the world’s commercial email. | Bird’s Momentum MTA adapts throughput per mailbox provider in real time, while dedicated IPs and pools automate IP warm-up with shared-pool overflow. |
| 智能体工具 | Bird’s hosted MCP server lets AI agents send email and manage domains, templates, and inboxes directly, while the Bird CLI and typed SDKs bring the same operations to terminals and application code. | Test the exact operations your automation or coding agent will run, including error recovery. Bird’s CLI outputs structured JSON and semantic exit codes so scripts and agents can branch reliably. |
| 邮箱 | Bird’s agent mailboxes give support workflows and AI agents dedicated email addresses, grouped conversation threads, quote-stripped replies, and sender filtering. | Decide whether your app only needs a stateless inbound webhook or a persistent inbox that tracks threads, stores messages, and blocks unwanted senders before waking your agent. |
每个服务商适合哪些场景？
Weigh each provider’s core strength against the operational work it leaves to your team. Every head-to-head guide below compares the sending stack, agent tooling, inbound handling, migration steps, and published pricing.
Bird
事务性邮件、营销活动和智能体邮箱。 Bird runs its own global sending infrastructure for transactional receipts and audience-targeted marketing broadcasts, and also licenses PowerMTA for on-premises delivery. Programmable agent mailboxes handle inbound threads, replies, and sender rules in the same workspace. When migrating, map your current provider’s stream separation and suppression lists into Bird.
SendGrid
子用户与成熟的发送工作流 SendGrid subusers partition sending reputation, permissions, and credit caps across business units, and its CLI supports basic terminal sends. Because Inbound Parse forwards raw parsed email to your webhook without storing threads, inventory your inbound webhook handlers before migrating.
Amazon SES
AWS 应用中的邮件 The AWS CLI and AWS MCP Server let teams manage identities, configuration sets, and sends using existing IAM roles and SigV4 authentication. SES receiving rules drop incoming mail into S3 buckets or SNS topics, leaving parsing, storage, and reply threading to your own AWS services.
Mailgun
入站邮件路由 Mailgun Routes match incoming mail against header or recipient expressions and trigger forwarding or temporary storage. Its open-source MCP server exposes sending, domain, route, template, and deliverability tools, though you host and run the server process yourself.
Postmark
事务性邮件与群发邮件的分离 Postmark Message Streams keep transactional mail and broadcast traffic on separate IP pools by default. Postmark provides an open-source MCP server and CLI for templates and delivery inspection, while its inbound webhook posts parsed JSON to your app without hosted mailbox state.
MailerSend
通过 CLI 和 MCP 进行邮件操作 MailerSend’s hosted MCP server and CLI cover email and SMS sending alongside domain, template, webhook, and suppression management. When migrating, keep temporary On Hold soft-bounce suppressions separate so 72-hour holds do not become permanent blocks.
Brevo
联系人与营销活动操作 Brevo’s MCP server connects AI tools to CRM contacts, campaigns, templates, and domains, while its CLI focuses on OAuth app setup and local testing. Note that batch retry deduplication applies to the entire batch payload for 30 minutes.
Resend
React 模板与邮件接收 Resend’s Node SDK renders React Email components directly on send, and its receiving API exposes inbound content, attachments, and reply headers. Resend also offers a hosted MCP server and CLI for sending and domain management.
各家公开邮件套餐如何对比？
Expand any provider below to compare Bird’s live rates against that vendor’s published plans at matching monthly volumes. Pay attention to how billing works: a Bird funding deposit stays in your workspace as spendable balance across channels, whereas a bundled tier charges a flat fee for a fixed monthly email cap. Each competitor figure links to its pricing page with the date it was verified.
Bird / Amazon SES
Bird 付费套餐每月向共享余额存入一笔预存款。事务性邮件发送按套餐费率计费。以下比较假设余额仅用于电子邮件；其他用量和附加功能需另外付费。
定价对比结论: Not comparable. 在每个竞品的额度下，Bird 的预估每月资金需求取付费套餐预存款与按公布费率计算的事务性用量两者中的较大值。免费套餐在适用时使用其包含的额度。预存款是可消费的余额，而非额外费用。只有用量匹配且费率完整的币种才会影响结论。
| Bird 层级 | 付费套餐额度 | Bird | Amazon SES |
|---|---|---|---|
| Free | 1,000 | 4 在该发送量下的套餐展开以对比所有选项及其计费条款。 匹配发送量 À la carte outbound email: $0.10 / 1,000 emails 1,000 emails No monthly fee; uncapped usage rate, not a monthly allowance; attachment data charged separately. 按公布价格 匹配发送量 Essentials: $0.16 per 1,000 emails 1,000 emails Usage rate for the 0–10M emails/month band, not a monthly allowance. No account fee; attachment data charged separately. Tiered rates apply marginally; higher-volume rates are on the publisher page. 按公布价格 匹配发送量 Pro: $0.22 per 1,000 emails 1,000 emails Usage rate for the 0–10M emails/month band, not a monthly allowance. $105 per account per region per month; attachment data charged separately. Tiered rates apply marginally; higher-volume rates are on the publisher page. 按公布价格 匹配发送量 Enterprise: $0.23 per 1,000 emails 1,000 emails Usage rate for the 0–10M emails/month band, not a monthly allowance. $500 per account per region per month; attachment data charged separately. Tiered rates apply marginally; higher-volume rates are on the publisher page. 按公布价格 | |
| Email Startup | 付费套餐不含额度 | €15 / month to shared balance (EUR); email usage charged separately $15 / month to shared balance (USD); email usage charged separately | 查看下方已公布的套餐 |
| Email Growth | 付费套餐不含额度 | €250 / month to shared balance (EUR); email usage charged separately $250 / month to shared balance (USD); email usage charged separately | 查看下方已公布的套餐 |
| Email Scale 1,000 | 付费套餐不含额度 | €1,000 / month to shared balance (EUR); email usage charged separately $1,000 / month to shared balance (USD); email usage charged separately | 查看下方已公布的套餐 |
| Email Scale 2,500 | 付费套餐不含额度 | €2,500 / month to shared balance (EUR); email usage charged separately $2,500 / month to shared balance (USD); email usage charged separately | 查看下方已公布的套餐 |
| Email Scale 5,000 | 付费套餐不含额度 | €5,000 / month to shared balance (EUR); email usage charged separately $5,000 / month to shared balance (USD); email usage charged separately | 查看下方已公布的套餐 |
| Email Scale 10,000 | 付费套餐不含额度 | €10,000 / month to shared balance (EUR); email usage charged separately $10,000 / month to shared balance (USD); email usage charged separately | 查看下方已公布的套餐 |
Amazon SES: 已公布的套餐
1,000 emails
No monthly fee; uncapped usage rate, not a monthly allowance; attachment data charged separately.
按公布价格
1,000 emails
Usage rate for the 0–10M emails/month band, not a monthly allowance. No account fee; attachment data charged separately. Tiered rates apply marginally; higher-volume rates are on the publisher page.
按公布价格
1,000 emails
Usage rate for the 0–10M emails/month band, not a monthly allowance. $105 per account per region per month; attachment data charged separately. Tiered rates apply marginally; higher-volume rates are on the publisher page.
按公布价格
1,000 emails
Usage rate for the 0–10M emails/month band, not a monthly allowance. $500 per account per region per month; attachment data charged separately. Tiered rates apply marginally; higher-volume rates are on the publisher page.
按公布价格
Bird / Brevo
Bird 付费套餐每月向共享余额存入一笔预存款。事务性邮件发送按套餐费率计费。以下比较假设余额仅用于电子邮件；其他用量和附加功能需另外付费。
定价对比结论: Mixed by volume. 在每个竞品的额度下，Bird 的预估每月资金需求取付费套餐预存款与按公布费率计算的事务性用量两者中的较大值。免费套餐在适用时使用其包含的额度。预存款是可消费的余额，而非额外费用。只有用量匹配且费率完整的币种才会影响结论。
| 每月邮件数 | Bird 套餐及每月所需资金 | Brevo |
|---|---|---|
| 5,000 | Email Startup: €15 (EUR) | |
| 50,000 | Email Startup: €18.000000000000004 (EUR) | |
| 100,000 | Email Startup: €36.00000000000001 (EUR) | |
| 250,000 | Email Startup: €90.00000000000001 (EUR) | |
| 500,000 | Email Startup: €180.00000000000003 (EUR) | |
| 150,000 | Email Startup: €54.00000000000001 (EUR) | |
| 1,000,000 | Email Startup: €360.00000000000006 (EUR) | |
| 3,000,000 | Email Scale 1,000: €1,000 (EUR) |
Brevo: 已公布的套餐
Bird / MailerSend
Bird 付费套餐每月向共享余额存入一笔预存款。事务性邮件发送按套餐费率计费。以下比较假设余额仅用于电子邮件；其他用量和附加功能需另外付费。
定价对比结论: Mixed by volume. 在每个竞品的额度下，Bird 的预估每月资金需求取付费套餐预存款与按公布费率计算的事务性用量两者中的较大值。免费套餐在适用时使用其包含的额度。预存款是可消费的余额，而非额外费用。只有用量匹配且费率完整的币种才会影响结论。
| 每月邮件数 | Bird 套餐及每月所需资金 | MailerSend |
|---|---|---|
| 500 | Free: $0 (USD) | |
| 5,000 | Email Startup: $15 (USD) | |
| 50,000 | Email Startup: $20 (USD) | |
| 100,000 | Email Startup: $40 (USD) | |
| 250,000 | Email Startup: $100 (USD) | |
| 500,000 | Email Startup: $200 (USD) | |
| 1,000,000 | Email Startup: $400 (USD) | |
| 2,000,000 | Email Startup: $800 (USD) |
MailerSend: 已公布的套餐
Bird / Mailgun
Bird 付费套餐每月向共享余额存入一笔预存款。事务性邮件发送按套餐费率计费。以下比较假设余额仅用于电子邮件；其他用量和附加功能需另外付费。
定价对比结论: Bird. 在每个竞品的额度下，Bird 的预估每月资金需求取付费套餐预存款与按公布费率计算的事务性用量两者中的较大值。免费套餐在适用时使用其包含的额度。预存款是可消费的余额，而非额外费用。只有用量匹配且费率完整的币种才会影响结论。
| 每月邮件数 | Bird 套餐及每月所需资金 | Mailgun |
|---|---|---|
| 50,000 | Email Startup: $20 (USD) | |
| 100,000 | Email Startup: $40 (USD) | |
| 250,000 | Email Startup: $100 (USD) | |
| 500,000 | Email Startup: $200 (USD) | |
| 1,000,000 | Email Startup: $400 (USD) | |
| 2,500,000 | Email Startup: $1,000 (USD) |
Mailgun: 已公布的套餐
Bird / Postmark
Bird 付费套餐每月向共享余额存入一笔预存款。事务性邮件发送按套餐费率计费。以下比较假设余额仅用于电子邮件；其他用量和附加功能需另外付费。
定价对比结论: Mixed by volume. 在每个竞品的额度下，Bird 的预估每月资金需求取付费套餐预存款与按公布费率计算的事务性用量两者中的较大值。免费套餐在适用时使用其包含的额度。预存款是可消费的余额，而非额外费用。只有用量匹配且费率完整的币种才会影响结论。
| 每月邮件数 | Bird 套餐及每月所需资金 | Postmark |
|---|---|---|
| 100 | Free: $0 (USD) | |
| 10,000 | Email Startup: $15 (USD) | |
| 50,000 | Email Startup: $20 (USD) | |
| 125,000 | Email Startup: $50 (USD) | |
| 300,000 | Email Startup: $120 (USD) | |
| 700,000 | Email Startup: $280 (USD) | |
| 1,500,000 | Email Startup: $600 (USD) |
Postmark: 已公布的套餐
Bird / Resend
Bird 付费套餐每月向共享余额存入一笔预存款。事务性邮件发送按套餐费率计费。以下比较假设余额仅用于电子邮件；其他用量和附加功能需另外付费。
定价对比结论: Mixed by volume. 在每个竞品的额度下，Bird 的预估每月资金需求取付费套餐预存款与按公布费率计算的事务性用量两者中的较大值。免费套餐在适用时使用其包含的额度。预存款是可消费的余额，而非额外费用。只有用量匹配且费率完整的币种才会影响结论。
| 每月邮件数 | Bird 套餐及每月所需资金 | Resend |
|---|---|---|
| 3,000 | Email Startup: $15 (USD) | |
| 50,000 | Email Startup: $20 (USD) | |
| 100,000 | Email Startup: $40 (USD) | |
| 200,000 | Email Startup: $80 (USD) | |
| 500,000 | Email Startup: $200 (USD) | |
| 1,000,000 | Email Startup: $400 (USD) | |
| 2,500,000 | Email Startup: $1,000 (USD) |
Resend: 已公布的套餐
Bird / SendGrid
Bird 付费套餐每月向共享余额存入一笔预存款。事务性邮件发送按套餐费率计费。以下比较假设余额仅用于电子邮件；其他用量和附加功能需另外付费。
定价对比结论: Not comparable. 在每个竞品的额度下，Bird 的预估每月资金需求取付费套餐预存款与按公布费率计算的事务性用量两者中的较大值。免费套餐在适用时使用其包含的额度。预存款是可消费的余额，而非额外费用。只有用量匹配且费率完整的币种才会影响结论。
SendGrid: 已公布的套餐
50,000 emails
Monthly billing; published volume range is 50,000 to 100,000 emails. Taxes and overages may apply.
按公布价格
100,000 emails
Monthly billing; published volume range is 100,000 to 2,500,000 emails. Taxes and overages may apply.
按公布价格
如何选择邮件 API？
Bird 如何对比邮件 API 服务商？
应如何比较电子邮件 API 的成本？
切换前应如何测试邮件 API？
如何迁移到 Bird 的邮件 API？
继续阅读
先确定工作流，再规划迁移。