As far as I understand the code, smtp_easy_statemach function enters an endless while-loop in this case: Curl_pp_easy_statemach returns 0 (as select() has timedout). Maybe CURLE_OPERATION_TIMEDOUT should be returned here.
Is it the correct solution?

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** [bugs:#1184] SMTP: libcurl hangs when returning CURL_READFUNC_ABORT from readfunc callback**
**Status:** open
**Created:** Fri Jan 25, 2013 10:30 AM UTC by Patricia Muscalu
**Last Updated:** Fri Jan 25, 2013 10:30 AM UTC
**Owner:** nobody
The problem appears in 7.24 (I've not tested the earlier versions of libcurl).
The problem can also be reproduces with libcurl 7.28. 
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