Is port 587 (SMTP Submission) dangerous?

Port 587 is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose with standard security practices.

Should port 587 be open on my firewall?

Port 587 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 587 use?

Port 587 (SMTP Submission) uses the TCP transport protocol and falls under the Email category.

:587 (TCP)

SMTP Submission

Low 风险

TCP — Email

端口概览

端口号 587

服务名称 SMTP Submission

传输协议 TCP

类别 Email

安全风险 Low

端口范围知名端口 (0-1023)

什么是端口 587?

Mail Message Submission (MSA). The recommended port for email clients to submit outgoing mail using STARTTLS encryption. Preferred over port 25 for client mail submission.

TCP Email 常用

安全注意事项

端口587（SMTP Submission）被归类为低风险。该服务使用加密或攻击面极小，相对安全可以暴露。

建议：应用标准安全实践。保持软件更新并监控访问。

SMTP Submission

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端口概览

什么是端口 587?

安全注意事项

相关端口 — Email

相关术语