[GH-ISSUE #1111] [Bug] Office365 STARTTLS 无法发送邮件显示TLS失败 #749

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opened 2026-03-03 01:05:42 +03:00 by kerem · 4 comments

kerem commented

2026-03-03 01:05:42 +03:00

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Originally created by @LeenHawk on GitHub (Dec 18, 2025).
Original GitHub issue: https://github.com/certimate-go/certimate/issues/1111

Release Version / 软件版本

v0.4.9

Description / 缺陷描述

无法发送测试发送的时候显示

failed to send mail: dial failed: tls: first record does not look like a TLS handshake

Steps to reproduce / 复现步骤

使用一个office365的邮箱链接就会显示，但是可以连接的

root@xxxx:~# telnet smtp.office365.com 587
Trying 2603:1046:c03:e::2...
Connected to smtp.office365.com.
Escape character is '^]'.
220 KL1PR0401CA0023.outlook.office365.com Microsoft ESMTP MAIL Service ready at Thu, 18 Dec 2025 14:47:50 +0000

Originally created by @LeenHawk on GitHub (Dec 18, 2025). Original GitHub issue: https://github.com/certimate-go/certimate/issues/1111 ### Release Version / 软件版本 v0.4.9 ### Description / 缺陷描述无法发送测试发送的时候显示 ```shell failed to send mail: dial failed: tls: first record does not look like a TLS handshake ``` ### Steps to reproduce / 复现步骤使用一个office365的邮箱链接就会显示，但是可以连接的 ```shell root@xxxx:~# telnet smtp.office365.com 587 Trying 2603:1046:c03:e::2... Connected to smtp.office365.com. Escape character is '^]'. 220 KL1PR0401CA0023.outlook.office365.com Microsoft ESMTP MAIL Service ready at Thu, 18 Dec 2025 14:47:50 +0000 ```