Obtain Response String From a CURL Handle for SMTP Connections

Hello,

I suggest a new CURLINFO value, CURLINFO_RESPONSE_STRING, that obtains a
full response string from a CURL handle for SMTP connections. Having the
string would be immensely helpful for SMTP connections because it would
help diagnose errors.

Currently, libcurl provides CURLINFO_RESPONSE_CODE, which may be sufficient
for HTTP and FTP connections, but is not adequate for SMTP connections.

For example, refer to Google's support page titled, "SMTP error reference" (
https://support.google.com/a/answer/3726730?hl=en), which lists 15 cases
where SMTP status code 550 describes different errors. Extending libcurl to
provide a mechanism to obtain SMTP enhanced status codes would still not be
enough. On the same webpage, you'll find that there are 8 cases that have a
status code 550 and enhanced status code 5.7.1.

Currently, the only way to obtain the full response string is by
enabling CURLOPT_VERBOSE and CURLOPT_DEBUGFUNCTION, which is overkill for
this situation.

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Received on 2020-09-05