thanks a lot for your report and work.

I've pushed a fix to git just now, commit 72688317adcedb9508fd2. It is slightly different than yours but similar. I've also added test case 1507 that I've used to verify the fix.

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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:** Tue Feb 05, 2013 01:41 PM 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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