Connecting to 127.0.0.1 port 1225 ... connected
??? 220
<<< 220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000
>>> mail from:<u1@cus.cam.ac.uk>
??? 503 HELO or EHLO required
<<< 503 HELO or EHLO required
>>> mail from:<u2@cus.cam.ac.uk>
??? 503
<<< 503 HELO or EHLO required
>>> mail from:<u3@cus.cam.ac.uk>
??? 503
<<< 503 HELO or EHLO required
>>> mail from:<u4@cus.cam.ac.uk>
??? 503-
<<< 503-HELO or EHLO required
??? 503 Too many
<<< 503 Too many syntax or protocol errors
???*
Expected EOF read
End of script