I have an MX that receives all mail from the outside world, and then
relays it to a separate POP server. They are currently both running
EIMS (Eudora Internet Mail Server)...I have developed a bit of a
love/hate relationship with EIMS. I won't bother going into great
detail about the reasons why, but suffice to say I was hoping to
replace the primary MX with a Linux machine running Postfix.

After taking what I thought was rather meticulous care in getting
postfix configured properly, I sent a few test messages through it
and confirmed that they were relayed to the POP server properly.
Then yesterday I changed the IP address of the primary MX and gave
it's IP to the postfix box.

To my dismay, I discovered that not all of the messages were getting
relayed...some did get through just fine. Others were deferred with
messages in the info log like:

"Sep 20 16:02:36 smtp2 postfix/qmgr[1841]: 9CE8839364:
to=<SteveAndersonclarityconnect.com>, relay=none, delay=95827,
status=deferred (connect to mail.clarityconnect.com[206.64.143.5]:
server dropped connection)"

Other times it said "connection reset by peer" rather than "server
dropped connection".

I did some packet sniffing to try to determine what the hell was
going on, and discovered that after sending MAIL FROM:<address> and
receiving an OK response from EIMS, postfix just resets the
connection!

Does anyone know why in the world it would do that? And why would it
fail, defer a message, and then successfully deliver that same
message at a later time?

Below is an example of what's happening....if anyone can shed some
light on this behavior it would be appreciated.

EIMS:
220 mail.clarityconnect.com running Eudora Internet Mail Server 3.1.1

POSTFIX:
EHLO smtp2.clarityconnect.com

EIMS:
250-mail.clarityconnect.com hello smtp2.clarityconnect.com (209.150.228.46)
250-PIPELINING
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250-ENHANCEDSTATUSCODES
250-ETRN
250-AUTH CRAM-MD5 NTLM PLAIN LOGIN
250-AUTH=LOGIN
250 SIZE 2147483647

POSTFIX:
MAIL FROM:<neurosis7yahoo.com>

EIMS:
250 2.1.5 sender OK

POSTFIX:
RSET

EIMS:
250 2.0.0 connection reset

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