退信邮箱检测器

邮箱退信检测识别会退信的地址。硬退信是永久性失败。软退信是临时问题。我们的邮箱有效性检测两种都能捕获。免费邮箱检测可供测试。

邮箱退信检测在发送前验证。邮箱地址检测首先验证语法。邮箱域名检测确认 MX 记录。有效邮箱检测测试 SMTP 连接。退信预测准确率 99.9%。

邮箱退信检测平均降低 85% 退信。大多数用户从 15% 降至 2% 以下。邮箱有效性检测捕获无效地址。批量邮箱检测清理整个列表。效果立即可见。

可以！批量邮箱检测处理数百万。上传 CSV 进行批量邮箱退信检测。实时邮箱有效性检测 API 可用。邮箱地址检测大规模工作。提供批量折扣。

邮箱退信检测实时响应。实时邮箱有效性检测用于表单。批量邮箱检测每小时处理 5 万。邮箱地址检测即时返回结果。保证 99.99% 正常运行。

有！免费邮箱检测已包含。每天 100 次免费退信检测。邮箱有效性检测试用可用。测试批量邮箱检测功能。无需信用卡即可开始。

A hard bounce is a permanent delivery failure — the email address doesn't exist, the domain is invalid, or the mail server rejected the message permanently. You should remove hard bounces from your list immediately. A soft bounce is a temporary failure — the mailbox is full, the server was unavailable, or the message was too large. Soft bounces may succeed on retry, but addresses that soft bounce repeatedly should also be removed. BillionVerify's email bounce checker detects both hard and soft bounce risks before you send.

To reduce bounce rate: (1) verify your list with an email bounce checker before every send to remove invalid addresses, (2) remove hard bounces immediately and monitor soft bounces, (3) use double opt-in for new subscribers, (4) avoid purchasing email lists, and (5) clean inactive subscribers every 6 months. Most senders see bounce rates drop by 85% after using BillionVerify's bounce detection before a campaign.

Email bounce detection works by running SMTP verification on each address before you send — testing syntax, domain existence, MX records, and whether the specific mailbox accepts incoming mail. This identifies hard bounce risks (non-existent mailboxes) and risky addresses (catch-all domains, role accounts, disposable emails) without sending a real email. The entire check completes in under 3 seconds per address.