We recently migrated our Imail server to a new Win2003 Server and we are
getting disconnected from specific recipient servers (about 20 of
them). But only on messages above approx 1500 bytes. Anything below
that line seems to get through.
So I thought it could be an MTU issue. I read in a forum that by adding
the EnablePMTUBHDetect DWORD value of 1 to the Tcpip/Parameters registry
that this would force the packets to travel at a lower packet size (587
I think). This seemed to help - a lot of retried messages began going
through, but we are still seeing this with certain domains above a
certain size. A typical log snippet is below.
I have also read that Win2003 Server's DNS Service by default sends
packets above the previously standard 512 byte limit and this can cause
problems if the recipient server cannot handle that size of a packet.
I'm not an expert in this and was hoping someone with networking
experience might have an idea. Thanks.
(As a side note - when I migrated the server, we changed local IP
addresses, so I didn't export and then import the SMTP32 registry keys.
I tried, but the SMTP service wouldn't start, so I reverted back to the
default keys that were generated when Imail was installed on the new
machine. I'm not sure if this could be involved.)
We are using a Linksys BEFSX41 router. MTU is currently set at 1492.
10:11 04:24 SMTP-(fe220198000001e4) processing
d:\imail\spool\qfe220198000001e4.smd
10:11 04:24 SMTP-(fe220198000001e4) [x] looking up healthnet.com in
HOSTS and MX
10:11 04:24 SMTP-(fe220198000001e4) Trying healthnet.com (0)
10:11 04:24 SMTP-(fe220198000001e4) [x] Connecting socket to service
<SMTP> on host <healthnet.com> using protocol <tcp>
10:11 04:24 SMTP-(fe220198000001e4) [x] using source IP for
Rogersbenefit.com [192.168.0.4]
10:11 04:24 SMTP-(fe220198000001e4) Connect healthnet.com
[204.107.47.187:25] (1)
10:11 04:24 SMTP-(fe220198000001e4) 220 mailgate02.healthnet.com ESMTP
***** SMTP Ready *****
10:11 04:24 SMTP-(fe220198000001e4) >EHLO Rogersbenefit.com
10:11 04:24 SMTP-(fe220198000001e4) 250-mailgate02.healthnet.com
10:11 04:24 SMTP-(fe220198000001e4) 250-PIPELINING
10:11 04:24 SMTP-(fe220198000001e4) 250-SIZE 104857600
10:11 04:24 SMTP-(fe220198000001e4) 250-ETRN
10:11 04:24 SMTP-(fe220198000001e4) 250-STARTTLS
10:11 04:24 SMTP-(fe220198000001e4) 250 8BITMIME
10:11 04:24 SMTP-(fe220198000001e4) >MAIL FROM:<[EMAIL PROTECTED]>
10:11 04:24 SMTP-(fe220198000001e4) 250 Ok
10:11 04:24 SMTP-(fe220198000001e4) >RCPT To:<[EMAIL PROTECTED]>
10:11 04:24 SMTP-(fe220198000001e4) 250 Ok
10:11 04:24 SMTP-(fe220198000001e4) >DATA
10:11 04:24 SMTP-(fe220198000001e4) 354 End data with <CR><LF>.<CR><LF>
10:11 04:25 SMTP-(fe220198000001e4) [E] didn't send
"FOXwGPBxix/OZhBum7oDoHuF3kOMhljQd+iyJZm7ASeIEMz51ASPWhrHTyZB1sM1ZrBpJJSM
": connection reset10:11 04:25 SMTP-(fe220198000001e4) [X] send error
4294967295 != 74
10:11 04:25 SMTP-(fe220198000001e4) >.
10:11 04:25 SMTP-(fe220198000001e4) [E] didn't send ".
": connection reset10:11 04:25 SMTP-(fe220198000001e4) rl-recv:
connection reset
10:11 04:25 SMTP-(fe220198000001e4)
10:11 04:25 SMTP-(fe220198000001e4) SMTP_DELIV_FAILED
10:11 04:25 SMTP-(fe220198000001e4) >QUIT
10:11 04:25 SMTP-(fe220198000001e4) [E] didn't send "QUIT
": connection reset10:11 04:25 SMTP-(fe220198000001e4) rl-recv:
connection reset
10:11 04:25 SMTP-(fe220198000001e4)
10:11 04:25 SMTP-(fe220198000001e4) [u] closing socket (u)
10:11 04:25 SMTP-(fe220198000001e4) requeuing
d:\imail\spool\qfe220198000001e4.smd R0 T3
10:11 04:25 SMTP-(fe220198000001e4) finished
d:\imail\spool\qfe220198000001e4.smd status=3
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