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HP-UX
Sendmail not submitting Email on '.'
Post 302331949 by john_exonets on Tuesday 7th of July 2009 03:53:31 PM
07-07-2009
"there is no direct connection to hold open." ...Huh? I guess it depends on how you define things. If your Email server is going to transfer an Email to my Email server, it opens a TCP connection to port 25 on my server and using the SMTP protocol, holds that connection open until my server either closes the connection or yours does.
In this particular case, your server starts the process (I.E. MAIL FROM:... RCPT TO: ... DATA ...) but when you send the '.' on its own line to signal the end of the message, my server does nothing like its thinking the '.' is still part of the 'DATA' segment. Since your server thinks its already sent the message, its waiting to see the '250 OK' message back from my server, but my server is still accepting input for some reason. One side or the other times out and closes the connection. My server aborts the message and never sends it on. Your server (may) think its successfully sent the message and deletes it. Big problem for me
I hope that clarifies things.
In this particular case, your server starts the process (I.E. MAIL FROM:... RCPT TO: ... DATA ...) but when you send the '.' on its own line to signal the end of the message, my server does nothing like its thinking the '.' is still part of the 'DATA' segment. Since your server thinks its already sent the message, its waiting to see the '250 OK' message back from my server, but my server is still accepting input for some reason. One side or the other times out and closes the connection. My server aborts the message and never sends it on. Your server (may) think its successfully sent the message and deletes it. Big problem for me
I hope that clarifies things.|
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LEARN ABOUT DEBIAN
tcpconnect
TCPCONNECT(1) General Commands Manual TCPCONNECT(1) NAME
tcpconnect - general TCP/IP client SYNOPSIS
tcpconnect [-irv] [-l localaddr] host port DESCRIPTION
tcpconnect creates a TCP/IP connection to a server running on the machine host, listening to port port. It then reads standard input and sends to the remote server, and data received from the server is printed to standard output. When end-of-file is reached on both standard input and the TCP/IP connection, tcpconnect terminates. OPTIONS
-i Terminate at end-of-file on standard input; don't wait for the server to close the connection. -r Terminate when the remote server closes the connection; don't wait for end-of-file on standard input. -v Verbose mode. Prints a message to standard error when the connection has been established. -l addr:port Bind the local end-point of the connection to IP address addr, TCP port port. Either the IP address or the port, but not both, may be left out, meaning that the operating system gets to choose that part by itself. SEE ALSO
tcplisten(1), telnet(1), tcpbug(1). BUGS
The names of the options are not yet finalized, and may change at a future release. 1997 April 13 TCPCONNECT(1)