我使用 telnet smtp.gmail.com 465 測試 Gmail 的 SMTP Server port 465, 但卻得不到回應, 幾秒鐘之後 time out.
請問現在的 Gmail SMTP server 已不再支援 port 465 (SSL), 都必須使用 port 587 (TLS) 來傳送 email 的嗎?
感謝.
2016-12-25 20:18 發佈
我回來了 wrote:
其實我只是想用 Telnet...(恕刪)
465 是 SSL 連線,
從一開始就要進行 ssl handshake,
用 telnet 是做不到 ssl handshake, 所以無法接收對方的 greeting 訊息.
587 是 SMTP TLS 的埠號, 基本上不下 TLS 指令的話, 它也就只是尋常的 TCP PORT (就像 25 port SMTP一樣),
當然你可以一般連線並取得對方丟過來的 greeting 訊息.
至於 smtp.gmail.com 465 埠有無這服務, 肯定是有的.
C:\>openssl.exe s_client -connect smtp.gmail.com:465
Loading 'screen' into random state - done
CONNECTED(00000198)
depth=2 /C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
verify error:num=20:unable to get local issuer certificate
verify return:0
---
Certificate chain
0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=smtp.gmail.com
i:/C=US/O=Google Inc/CN=Google Internet Authority G2
1 s:/C=US/O=Google Inc/CN=Google Internet Authority G2
i:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
2 s:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=smtp.gmail.com
issuer=/C=US/O=Google Inc/CN=Google Internet Authority G2
---
No client certificate CA names sent
---
SSL handshake has read 3225 bytes and written 448 bytes
---
New, TLSv1/SSLv3, Cipher is DES-CBC3-SHA
Server public key is 2048 bit
SSL-Session:
Protocol : TLSv1
Cipher : DES-CBC3-SHA
Session-ID: CBDEB9A6604E8C73FC93160D3264C3372D031F9B05C3E12CB566A5BF801CAB3B
Session-ID-ctx:
Master-Key: 83E7DB349DF8631118FB99474963B86225959FD861794E3FFF8F71D9ACC9368D
FC8FF76BCB515264B71A5EAE548FFA4F
Key-Arg : None
Start Time: 1482815432
Timeout : 300 (sec)
Verify return code: 20 (unable to get local issuer certificate)
---
220 smtp.gmail.com ESMTP j68sm85639252pfk.95 - gsmtp
內文搜尋
從 APP 打開
X