我正在尝试使用Emacs gnus连接到我的Gmail帐户。这是相关的配置代码，主要用于from here：
(setq tls-program '("openssl s_client -CAfile C:/Users/GGustafson/gmail.crt -connect %h:%p -no_ssl2 -ign_eof"))
(setq gnus-select-method '(nnimap "gmail"
(nnimap-address "imap.gmail.com")
(nnimap-server-port 993)
(nnimap-stream ssl)
(nnimap-authinfo-file "~/.authinfo")))
(setq message-send-mail-function 'smtpmail-send-it
smtpmail-starttls-credentials '(("smtp.gmail.com" 587 nil nil))
smtpmail-auth-credentials '(("smtp.gmail.com" 587 "[email protected]" nil))
smtpmail-default-smtp-server "smtp.gmail.com"
smtpmail-smtp-server "smtp.gmail.com"
smtpmail-smtp-service 587)
重新启动后，启动emacs并执行
M-x gnus，我得到以下*Messages*：Opening connection to imap.gmail.com via tls...
gnutls.c: [1] (Emacs) GnuTLS library not found
Opening TLS connection to `imap.gmail.com'...
Opening TLS connection with `openssl s_client -CAfile C:/Users/GGustafson/gmail.crt -connect imap.gmail.com:993 -no_ssl2 -ign_eof'...done
Opening TLS connection to `imap.gmail.com'...done
nnimap (gmail) open error: 'depth=3 C = US, O = Equifax, OU = Equifax Secure Certificate Authority^M
'. Continue? (y or n) y
这里到底发生了什么？以前我遇到了一些
verify error:num=20:unable to get local issuer certificate错误，但是我通过following these instructions修复了这些错误，这使我必须在-CAfile参数中添加适当证书的副本。为了确认这一点，我可以这样做：
C:\Users\GGustafson>openssl s_client -CAfile C:/Users/GGustafson/gmail.crt -connect imap.gmail.com:993 -no_ssl2 -ign_eof
CONNECTED(00000003)
depth=3 C = US, O = Equifax, OU = Equifax Secure Certificate Authority verify return:1
depth=2 C = US, O = GeoTrust Inc., CN = GeoTrust Global CA verify return:1
depth=1 C = US, O = Google Inc, CN = Google Internet Authority G2 verify return:1
depth=0 C = US, ST = California, L = Mountain View, O = Google Inc, CN = imap.gmail.com verify return:1
---
Certificate chain
0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=imap.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-----
****SNIP****
Start Time: 1387083719
Timeout : 300 (sec)
Verify return code: 0 (ok)
---
* OK Gimap ready for requests from 128.84.124.191 el7if9939594qeb.109
我无法使用gnus读取Gmail吗？我在Windows 7上使用Cygwin openssl。
最佳答案
我需要在Windows 7上从gnus连接到gmail的一件事是：
;; So gnutls can find trustfiles on windows
(eval-after-load "gnutls"
'(progn
(setq gnutls-trustfiles '("c:/cygwin/usr/ssl/certs/ca-bundle.trust.crt" "c:/cygwin/usr/ssl/certs/ca-bundle.crt"))))
除此之外，其余的设置类似：
(setq gnus-secondary-select-methods
'(
(nnimap "gmail"
(nnimap-address "imap.gmail.com")
(nnimap-server-port 993)
(nnimap-stream ssl)
(nnir-search-engine imap)
(nnimap-authinfo-file "~/.authinfo")
)
(nntp "news.gmane.org")
(nnfolder "archive"
(nnfolder-directory "~/Documents/Text/Gnus/Mail/archive")
(nnfolder-active-file "~/Documents/Text/Gnus/Mail/archive/active")
(nnfolder-get-new-mail nil)
(nnfolder-inhibit-expiry t))))
能够从gmail阅读邮件。