Hello,

we are sending SMTP mails using libcurl. On many systems this works fine but on sone systems it does not.

This is the wireshark protocol. It shows that libcurl sends some RSET command after successfully setting some RCPT. Sadly, as soon as we activate logging it seems to behave differently and all shows fine.

108 10:29:01 06.03.2013 5.7475320 129.224.72.18 129.227.169.11 SMTP SMTP:Rsp 220 USEA-NARELAY1.na.uis.zzzzzzzzzzzzzz.com Microsoft ESMTP MAIL Service, Version: 7.5.7601.17514 ready at Wed, 6 Mar 2013 03:29:00 -0600 , 133 bytes
109 10:29:01 06.03.2013 5.7478480 129.227.169.11 129.224.72.18 SMTP SMTP:Cmd EHLO FRPAR-GOUCHERP, 21 bytes
110 10:29:01 06.03.2013 5.8595710 129.224.72.18 129.227.169.11 SMTP SMTP:Rsp 250 -USEA-NARELAY1.na.xxxxx.yyyyy.com Hello [129.227.169.11], 248 bytes
111 10:29:01 06.03.2013 5.8599390 129.227.169.11 129.224.72.18 SMTP SMTP:Cmd MAIL FROM:<xxxx.yyyyy_at_fr.zzzzzzzzzzzzzz.com>, 40 bytes
112 10:29:01 06.03.2013 5.9797930 129.224.72.18 129.227.169.11 SMTP SMTP:Rsp 250 2.1.0 xxxx.yyyyy_at_fr.zzzzzzzzzzzzzz.com....Sender OK, 51 bytes
113 10:29:01 06.03.2013 5.9800930 129.227.169.11 129.224.72.18 SMTP SMTP:Cmd RCPT TO:<xxxx.yyyyy_at_fr.zzzzzzzzzzzzzz.com>, 38 bytes
114 10:29:01 06.03.2013 6.0920800 129.224.72.18 129.227.169.11 SMTP SMTP:Rsp 250 2.1.5 xxxx.yyyyy_at_fr.zzzzzzzzzzzzzz.com , 39 bytes
115 10:29:01 06.03.2013 6.0924200 129.227.169.11 129.224.72.18 SMTP SMTP:Cmd RCPT TO:<xxxx.yyyyy_at_fr.zzzzzzzzzzzzzz.com>, 38 bytes
116 10:29:01 06.03.2013 6.2120500 129.224.72.18 129.227.169.11 SMTP SMTP:Rsp 250 2.1.5 xxxx.yyyyy_at_fr.zzzzzzzzzzzzzz.com , 39 bytes
117 10:29:01 06.03.2013 6.2221180 129.227.169.11 129.224.72.18 SMTP SMTP:Cmd RSET, Resets mail connection
130 10:29:01 06.03.2013 6.3383100 129.224.72.18 129.227.169.11 SMTP SMTP:Rsp 250 2.0.0 Resetting, 21 bytes

Any idea what causes libcurl to send RSET in this moment?

Best,

Volker
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Received on 2013-03-07