[PHP] [QUESTION] MAIL: Send a NOOP instead of DATA

I wrote a class to send mail by remote mail server. But it was failed. So I captured the network packets by tcpdump, and found that there is a strange packet NOOP was sent. But in the source code I mean to send command DATA. I don't know why a NOOP packet was sent instead. Here is my php source

Re: [PHP] [QUESTION] MAIL: Send a NOOP instead of DATA

Wang Chen said the following on 2008-1-16 11:38: I wrote a class to send mail by remote mail server. But it was failed. So I captured the network packets by tcpdump, and found that there is a strange packet NOOP was sent. But in the source code I mean to send command DATA. I don't know why a