From: a...@ashleysheridan.co.uk

> Could it be that there are connection limits on the remote server?
> 
> Thanks,
> Ash

Only if you are opening a new connection for each message. Any decent
SMTP client should be able to send multiple messages over a single
connection.

You could capture the traffic with Wireshark. Set the capture filter to
only grab SMTP traffic to that server's IP address. Unless it is going
through SSL/TLS, you can read the handshake messages. They will look
something like this:

-----8<--------------------------------
220 lists.php.net ESMTP Postfix
EHLO ashleysheridan.co.uk
250-mail.php.net
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH LOGIN PLAIN
250 8BITMIME
MAIL FROM:<a...@ashleysheridan.co.uk>
250 Ok
RCPT TO:<php-general@lists.php.net>
250 Ok
-----8<--------------------------------

The lines beginning with numbers are the server's responses. All of them
should be ASCII/UTF-8 text.

There is one other possibility. According to the RFCs, the standard line
ending for email is CRLF. Make sure your system is sending both
characters after each line. There is a slim chance the server is cutting
you off after some number of bytes if you are only sending a LF.

Bob McConnell

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