Hi Steve, Daniel,

> Additionally, rather than try a TLS upgraded connection have you tried using smtps:// to see if that works? Here libcurl should try and create an SSL connection using port 465 - again I don't know if this works through
> a proxy.

With smtps:// substituted there-in (and using ports 587/465), the code when run complains thus:
* Protocol smtps not supported or disabled in libcurl
* Unsupported protocol

However, please note that curl-config --feature tells me:
SSL
IPv6
libz
IDN
NTLM
NTLM_WB

and on my machine, curl -V gives:
curl 7.28.1 (i686-pc-linux-gnu) libcurl/7.28.1 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp smtp smtps telnet tftp
Features: IDN IPv6 Largefile NTLM NTLM_WB SSL libz

I believe it is safe to assume I've been using curl built with SSL support and that the version I am using (v7.28.1) supports smtps too.

Also, to your question as to whether I tried the code with CURLOPT_USE_SSL in place: yes, and on doing so, I get the following:

* About to connect() to proxy xxxxxxxxxx port 8080 (#0)
* Trying xx.xxx.xxx.xx... * connected
* Connected to xxxxxxxxxx (xx.xxx.xxx.xx) (xx.xxx.xxx.xx) port 8080 (#0)
* Establish HTTP proxy tunnel to smtp.gmail.com:587
> CONNECT smtp.gmail.com:587 HTTP/1.1
Host: smtp.gmail.com:587
Proxy-Connection: Keep-Alive

< HTTP/1.1 200 Connection established
<
* Proxy replied OK to CONNECT request
< 220 mx.google.com ESMTP s1sm118599anj.1
> EHLO xxxxxxxxx
< 250-mx.google.com at your service, [15.211.201.86]
< 250-SIZE 35882577
< 250-8BITMIME
< 250-STARTTLS
< 250-ENHANCEDSTATUSCODES
< 250 PIPELINING
> MAIL FROM:<xxx_at_gmail.com>
< 530 5.7.0 Must issue a STARTTLS command first. s1sm118599anj.1
* Access denied: 530
> QUIT
< 221 2.0.0 closing connection s1sm118599anj.1
* Closing connection #0
* Login denied

Apologies if I've still missed out on anything very obvious (that should've been, to get it to work!). Thanks for your patience again.

Thanks,
Naveen

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Received on 2012-12-04