Question

我正在尝试使用openssl（Windows平台）来远程访问我的gmail并将示例电子邮件发送到任何其他任意电子邮件地址。我正在阅读https://easyengine.io/tutorials/mail/server/testing/smtp/上的手册，但是我甚至陷入了第一步。尝试执行命令时

OpenSSL> s_client -starttls smtp -connect gmail.com：25

我遇到如下错误

OpenSSL> s_client -starttls smtp -connect gmail.com:25 4792：错误：0200274C：系统库：连接：原因（1868）：crypto \ bio \ b_sock2.c：110： 4792：错误：2008A067：BIO例程：BIO_connect：连接错误：crypto \ bio \ b_sock2.c：111： connect：errno = 0 s_client中的错误

尝试连接端口465,587时，我也收到类似的错误。您能帮我吗？

Answer 1

您需要连接到正确的子域

smtp.gmail.com端口25
smtp.gmail.com端口465
smtp.gmail.com端口587

这是工作连接的完整示例。

openssl s_client -starttls smtp -connect smtp.gmail.com:25
CONNECTED(00000003)
depth=2 OU = GlobalSign Root CA - R2, O = GlobalSign, CN = GlobalSign
verify return:1
depth=1 C = US, O = Google Trust Services, CN = Google Internet Authority G3
verify return:1
depth=0 C = US, ST = California, L = Mountain View, O = Google LLC, CN = smtp.gmail.com
verify return:1
---
Certificate chain
 0 s:C = US, ST = California, L = Mountain View, O = Google LLC, CN = smtp.gmail.com
   i:C = US, O = Google Trust Services, CN = Google Internet Authority G3
 1 s:C = US, O = Google Trust Services, CN = Google Internet Authority G3
   i:OU = GlobalSign Root CA - R2, O = GlobalSign, CN = GlobalSign
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=C = US, ST = California, L = Mountain View, O = Google LLC, CN = smtp.gmail.com

issuer=C = US, O = Google Trust Services, CN = Google Internet Authority G3

---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: RSA-PSS
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 3035 bytes and written 429 bytes
Verification: OK
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 2048 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---
250 SMTPUTF8

openssl问题（无法连接到gmail）

1 个答案: