I've done a little more experimenting: 7.33.0 works fine - I'll move ahead
using that version for now.

According to this link:
http://stackoverflow.com/questions/8054711/error-252-b2-1-5-send-some-mail-ill-try-my-best-f18sm1267047wiv-14
It could be that the VFRY requests are causing a red flag to be thrown on
the server side. The output from 7.33.0 looks just like the output from
7.29.0, except that the username is not passed on the same line as AUTH
LOGIN - no VFRY requests.

I did not see an option to disable the VFRY requests in the documentation.

Thanks,

Kerry

On Mon, Dec 30, 2013 at 1:00 PM, Kerry Loux <louxkr_at_gmail.com> wrote:

> Hello all,
>
> I've been using libcurl for just a little while now, using password
> authentication to send mail from gmail's smtp servers. Recently I added
> support for OAuth 2.0 to my application, and so I upgraded libcurl to
> 7.34.0 (from 7.29.0) in order to make use of the OAuth2 bearer token
> support.
>
> I'm using Windows 7 x64, and I built both version from source using "nmake
> /f Makefile.vc mode=static DEBUG=yes" and MSVC++ 2010.
>
> Without changing my code, the switch from 7.29.0 to 7.34.0 changed the
> response quite a bit. The latter now fails to send an e-mail, although the
> output suggests that is is "trying." I did check the changelog, but
> nothing jumped out at me. Did I miss something? Maybe the example works
> only because of a bug that's been fixed since 7.29?
>
> My code is based on the SMTP with TLS example here:
> http://curl.haxx.se/libcurl/c/smtp-tls.html. The output below was
> generated by using almost exactly this example - the only changes I made
> were to use my e-mail account info for the login, sender and recipient
> information, and I removed the line specifying the path to the security
> certificates (I've never had a problem with libcurl verifying certs without
> explicitly specifying this path).
>
> This is the dialog between libcurl 7.29.0 and the server (message was
> successfully sent):
>
> * About to connect() to smtp.gmail.com port 587 (#0)
> * Trying 173.194.68.108...
> * Connected to smtp.gmail.com (173.194.68.108) port 587 (#0)
> < 220 mx.google.com ESMTP ni10sm59654617qeb.23 - gsmtp
> > EHLO user
> < 250-mx.google.com at your service, [my ip]
> < 250-SIZE 35882577
> < 250-8BITMIME
> < 250-STARTTLS
> < 250-ENHANCEDSTATUSCODES
> < 250 CHUNKING
> > STARTTLS
> < 220 2.0.0 Ready to start TLS
> * schannel: SSL/TLS connection with smtp.gmail.com port 587 (step 1/3)
> * schannel: checking server certificate revocation
> * schannel: sending initial handshake data: sending 127 bytes...
> * schannel: sent initial handshake data: sent 127 bytes
> * schannel: SSL/TLS connection with smtp.gmail.com port 587 (step 2/3)
> * schannel: failed to receive handshake, need more data
> * schannel: SSL/TLS connection with smtp.gmail.com port 587 (step 2/3)
> * schannel: encrypted data buffer: offset 3539 length 4096
> * schannel: sending next handshake data: sending 134 bytes...
> * schannel: SSL/TLS connection with smtp.gmail.com port 587 (step 2/3)
> * schannel: encrypted data buffer: offset 59 length 4096
> * schannel: SSL/TLS handshake complete
> * schannel: SSL/TLS connection with smtp.gmail.com port 587 (step 3/3)
> * schannel: incremented credential handle refcount = 1
> * schannel: stored credential handle in session cache
> > EHLO user
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 213
> * schannel: encrypted data buffer: offset 213 length 16384
> * schannel: decrypted data length: 179
> * schannel: decrypted data added: 179
> * schannel: decrypted data cached: offset 179 length 16384
> * schannel: decrypted data buffer: offset 179 length 16384
> * schannel: decrypted data returned 179
> * schannel: decrypted data buffer: offset 0 length 16384
> < 250-mx.google.com at your service, [my ip]
> < 250-SIZE 35882577
> < 250-8BITMIME
> < 250-AUTH LOGIN PLAIN XOAUTH XOAUTH2 PLAIN-CLIENTTOKEN
> < 250-ENHANCEDSTATUSCODES
> < 250 CHUNKING
> > AUTH LOGIN bG91eGhvdXNlQGdtYWlsLmNvbQ==
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 53
> * schannel: encrypted data buffer: offset 53 length 16384
> * schannel: decrypted data length: 18
> * schannel: decrypted data added: 18
> * schannel: decrypted data cached: offset 18 length 16384
> * schannel: decrypted data buffer: offset 18 length 16384
> * schannel: decrypted data returned 18
> * schannel: decrypted data buffer: offset 0 length 16384
> < 334 UGFzc3dvcmQ6
> > QnVybmluZ0pldEZ1ZWw=
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 53
> * schannel: encrypted data buffer: offset 53 length 16384
> * schannel: decrypted data length: 20
> * schannel: decrypted data added: 20
> * schannel: decrypted data cached: offset 20 length 16384
> * schannel: decrypted data buffer: offset 20 length 16384
> * schannel: decrypted data returned 20
> * schannel: decrypted data buffer: offset 0 length 16384
> < 235 2.7.0 Accepted
> > MAIL FROM:<user1_at_gmail.com>
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 69
> * schannel: encrypted data buffer: offset 69 length 16384
> * schannel: decrypted data length: 43
> * schannel: decrypted data added: 43
> * schannel: decrypted data cached: offset 43 length 16384
> * schannel: decrypted data buffer: offset 43 length 16384
> * schannel: decrypted data returned 43
> * schannel: decrypted data buffer: offset 0 length 16384
> < 250 2.1.0 OK ni10sm59654617qeb.23 - gsmtp
> > RCPT TO:<user2_at_gmail.com>
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 69
> * schannel: encrypted data buffer: offset 69 length 16384
> * schannel: decrypted data length: 43
> * schannel: decrypted data added: 43
> * schannel: decrypted data cached: offset 43 length 16384
> * schannel: decrypted data buffer: offset 43 length 16384
> * schannel: decrypted data returned 43
> * schannel: decrypted data buffer: offset 0 length 16384
> < 250 2.1.5 OK ni10sm59654617qeb.23 - gsmtp
> > RCPT TO:<user3_at_gmail.com>
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 69
> * schannel: encrypted data buffer: offset 69 length 16384
> * schannel: decrypted data length: 43
> * schannel: decrypted data added: 43
> * schannel: decrypted data cached: offset 43 length 16384
> * schannel: decrypted data buffer: offset 43 length 16384
> * schannel: decrypted data returned 43
> * schannel: decrypted data buffer: offset 0 length 16384
> < 250 2.1.5 OK ni10sm59654617qeb.23 - gsmtp
> > DATA
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 85
> * schannel: encrypted data buffer: offset 85 length 16384
> * schannel: decrypted data length: 44
> * schannel: decrypted data added: 44
> * schannel: decrypted data cached: offset 44 length 16384
> * schannel: decrypted data buffer: offset 44 length 16384
> * schannel: decrypted data returned 44
> * schannel: decrypted data buffer: offset 0 length 16384
> < 354 Go ahead ni10sm59654617qeb.23 - gsmtp
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 85
> * schannel: encrypted data buffer: offset 85 length 16384
> * schannel: decrypted data length: 54
> * schannel: decrypted data added: 54
> * schannel: decrypted data cached: offset 54 length 16384
> * schannel: decrypted data buffer: offset 54 length 16384
> * schannel: decrypted data returned 54
> * schannel: decrypted data buffer: offset 0 length 16384
> < 250 2.0.0 OK 1388425743 ni10sm59654617qeb.23 - gsmtp
> * Connection #0 to host smtp.gmail.com left intact
>
>
> And the dialog between libcurl 7.34.0 and the server (and it fails to send
> the message):
>
> * Rebuilt URL to: smtp://smtp.gmail.com:587/
> * Hostname was NOT found in DNS cache
> * Adding handle: conn: 0x8d8588
> * Adding handle: send: 0
> * Adding handle: recv: 0
> * Curl_addHandleToPipeline: length: 1
> * - Conn 0 (0x8d8588) send_pipe: 1, recv_pipe: 0
> * Trying 173.194.68.108...
> * Connected to smtp.gmail.com (173.194.68.108) port 587 (#0)
> < 220 mx.google.com ESMTP e2sm57495043qas.21 - gsmtp
> > EHLO user
> < 250-mx.google.com at your service, [my ip]
> < 250-SIZE 35882577
> < 250-8BITMIME
> < 250-STARTTLS
> < 250-ENHANCEDSTATUSCODES
> < 250 CHUNKING
> > STARTTLS
> < 220 2.0.0 Ready to start TLS
> * schannel: SSL/TLS connection with smtp.gmail.com port 587 (step 1/3)
> * schannel: checking server certificate revocation
> * schannel: sending initial handshake data: sending 127 bytes...
> * schannel: sent initial handshake data: sent 127 bytes
> * schannel: SSL/TLS connection with smtp.gmail.com port 587 (step 2/3)
> * schannel: failed to receive handshake, need more data
> * schannel: SSL/TLS connection with smtp.gmail.com port 587 (step 2/3)
> * schannel: encrypted data buffer: offset 3539 length 4096
> * schannel: sending next handshake data: sending 134 bytes...
> * schannel: SSL/TLS connection with smtp.gmail.com port 587 (step 2/3)
> * schannel: encrypted data buffer: offset 59 length 4096
> * schannel: SSL/TLS handshake complete
> * schannel: SSL/TLS connection with smtp.gmail.com port 587 (step 3/3)
> * schannel: incremented credential handle refcount = 1
> * schannel: stored credential handle in session cache
> > EHLO user
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 213
> * schannel: encrypted data buffer: offset 213 length 16384
> * schannel: decrypted data length: 179
> * schannel: decrypted data added: 179
> * schannel: decrypted data cached: offset 179 length 16384
> * schannel: decrypted data buffer: offset 179 length 16384
> * schannel: decrypted data returned 179
> * schannel: decrypted data buffer: offset 0 length 16384
> < 250-mx.google.com at your service, [my ip]
> < 250-SIZE 35882577
> < 250-8BITMIME
> < 250-AUTH LOGIN PLAIN XOAUTH XOAUTH2 PLAIN-CLIENTTOKEN
> < 250-ENHANCEDSTATUSCODES
> < 250 CHUNKING
> > AUTH LOGIN
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 53
> * schannel: encrypted data buffer: offset 53 length 16384
> * schannel: decrypted data length: 18
> * schannel: decrypted data added: 18
> * schannel: decrypted data cached: offset 18 length 16384
> * schannel: decrypted data buffer: offset 18 length 16384
> * schannel: decrypted data returned 18
> * schannel: decrypted data buffer: offset 0 length 16384
> < 334 VXNlcm5hbWU6
> > bG91eGhvdXNlQGdtYWlsLmNvbQ==
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 53
> * schannel: encrypted data buffer: offset 53 length 16384
> * schannel: decrypted data length: 18
> * schannel: decrypted data added: 18
> * schannel: decrypted data cached: offset 18 length 16384
> * schannel: decrypted data buffer: offset 18 length 16384
> * schannel: decrypted data returned 18
> * schannel: decrypted data buffer: offset 0 length 16384
> < 334 UGFzc3dvcmQ6
> > QnVybmluZ0pldEZ1ZWw=
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 53
> * schannel: encrypted data buffer: offset 53 length 16384
> * schannel: decrypted data length: 20
> * schannel: decrypted data added: 20
> * schannel: decrypted data cached: offset 20 length 16384
> * schannel: decrypted data buffer: offset 20 length 16384
> * schannel: decrypted data returned 20
> * schannel: decrypted data buffer: offset 0 length 16384
> < 235 2.7.0 Accepted
> > VRFY <user2_at_gmail.com>
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 101
> * schannel: encrypted data buffer: offset 101 length 16384
> * schannel: decrypted data length: 71
> * schannel: decrypted data added: 71
> * schannel: decrypted data cached: offset 71 length 16384
> * schannel: decrypted data buffer: offset 71 length 16384
> * schannel: decrypted data returned 71
> * schannel: decrypted data buffer: offset 0 length 16384
> < 252 2.1.5 Send some mail, I'll try my best e2sm57495043qas.21 - gsmtp
> 252 2.1.5 Send some mail, I'll try my best e2sm57495043qas.21 - gsmtp
> > VRFY <user3_at_gmail.com>
> * schannel: client wants to read 16384 bytes
> * schannel: encrypted data buffer: offset 0 length 16384
> * schannel: encrypted data got 101
> * schannel: encrypted data buffer: offset 101 length 16384
> * schannel: decrypted data length: 71
> * schannel: decrypted data added: 71
> * schannel: decrypted data cached: offset 71 length 16384
> * schannel: decrypted data buffer: offset 71 length 16384
> * schannel: decrypted data returned 71
> * schannel: decrypted data buffer: offset 0 length 16384
> < 252 2.1.5 Send some mail, I'll try my best e2sm57495043qas.21 - gsmtp
> 252 2.1.5 Send some mail, I'll try my best e2sm57495043qas.21 - gsmtp
> * Connection #0 to host smtp.gmail.com left intact
>
> Any thoughts?
>
> Thanks,
>
> Kerry
>

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Received on 2013-12-30