SMTP HTTP HTTP CONNECT HTTP proxy # # Server-side HTTP/1.1 200 Mighty fine indeed smtp: sure hit me # # Client-side smtp http-proxy http SMTP send tunneled through HTTP proxy From: different To: another body smtp://smtp.1320:%SMTPPORT/1320 --mail-rcpt recipient@example.com --mail-from sender@example.com -T - -p -x %HOSTIP:%PROXYPORT # # Verify data after the test has been "shot" ^User-Agent: curl/.* EHLO 1320 MAIL FROM: RCPT TO: DATA QUIT From: different To: another body . CONNECT smtp.1320:%SMTPPORT HTTP/1.1 Host: smtp.1320:%SMTPPORT User-Agent: curl/7.24.0-DEV (i686-pc-linux-gnu) libcurl/7.24.0-DEV OpenSSL/1.0.0e zlib/1.2.3.4 c-ares/1.7.6-DEV libidn/1.23 libssh2/1.4.0_DEV librtmp/2.2e Proxy-Connection: Keep-Alive