Hi, I checked. I can't tell whether the MX server (it's the same server since I'm sending to the same recipient both at office and home) is implementing RDNS, but in both situation my IP has a valid PTR.
In the office environment, when I telnet to port 25 to the MX server, it is transparently proxied via the firewall, so my IP and the IP seen by the MX server is different. Transcript: 220 crystal.ncs.com.sg ESMTP Sendmail 8.11.6/8.11.6; Fri, 31 Jan 2003 10:54:12 +0800 250-crystal.ncs.com.sg Hello firewall.ncs.com.sg [203.126.130.66], pleased to meet you There is no delay at all when I do the telnet manually. At home environment, connection is via NAT router so my IP and the IP seen by the MX router (= the ISP's public IP) is different. In either case however, the IP seen by the MX server (either firewall / ISP public IP) has a PTR record associated to them. The commands I type afterwards is just like this: MAIL FROM:<> RCPT TO:<[EMAIL PROTECTED]> DATA test .. And in both cases when I use this commands directly on the MX server, everything goes smoothly, no apparent delay is noticed at all. cheers, James > -----Original Message----- > From: Davide Libenzi [SMTP:[EMAIL PROTECTED]] > Sent: Friday, January 31, 2003 2:06 AM > To: '[EMAIL PROTECTED]' > Subject: [xmail] Re: smtp relay delivery delay? > > > On Thu, 30 Jan 2003, James Budiono NCS wrote: > > > > > > Hi, > > > > > > I'm new to xmail. I've just downloaded the package (1.11 and 1.12) and > > > found the following problem. > > > > > > The environment > > > ============ > > > I've tested xmail in two Win2K environments: office and home. > > > (Actually I tested it in a laptop) which I bring back and forth. > > > > > > Environment at office > > > - DHCP > > > - Outbound port 25 is open to the rest of the world > > > - Internal DNS servers is accessible (tested using nslookup) > > > > > > Environment at home > > > - ADSL connection behind a NAT router > > > - Outbound port 25 is open. > > > - DNS is cached by the NAT router (ie, DNS server is pointed to the > NAT > > > router instead of ISP's DNS). > > > > > > Settings: > > > ====== > > > I do not change anything in the mailroot directory (except > > > ctrlaccounts.tab), everything is as it is as it comes from the zip > file. > > > > > > The test > > > ====== > > > 1. Using telnet, I've deposited an account to my corporate email > address. > > > (with blank MAIL FROM). > > > 2. When I'm in office, it takes a very long time (19 minutes on last > > > testing) to delivery the email. (Note: only one email is in the > queue). > > > 3. When I'm at home, the delivery is very fast (as expected). > > > 4. When I deposited the email at office, shutdown the machine, bring > it > > > back home and connect it, it instantenously sends the email. > > > > > > I am completely puzzled by this since the both environments looks > exactly > > > the same. > > > Am I missing something here? > > > > > > cheers, > > > James > > > > > > Variations I've tried > > > ============== > > > 1. Use SmartDNSHost with office DNS server: don't help. > > > 2. Use DefaultSMTPGateways: it works perfectly (but unfortunately not > what > > > I needed). > > > > > > Other Notes: > > > ========== > > > 1. Delivery to local user (xmailuser) is very fast. > > > 2. Delivery, when default smtp gateway is set, is very fast. > > > 3. I'm able to telnet (prt 25) to any mail server in the world in > both > > > environments. > > > 4. Using the same telnet method, I can successfully deposit the same > email > > > in my company's MX server. > > > 5. I'm able to resolve MX records in both environments. > > > 6. I do not have "slog" since all mails is routed successfully, albeit > > > very very slow. > > > 7. Capture of logs from office: > > > "xmailserver.test" "1043919381372.2260.JAMES-PC" "S1D" "" > > > "[EMAIL PROTECTED]" "SMTP" "ncs.com.sg" "2003-01-30 > > > 17:57:10" > > > > > > 8. Capture of logs from home: > > > "xmailserver.test" "1043861453995.1756.JAMES-PC" "SE" "" > > > "[EMAIL PROTECTED]" "SMTP" "crystal.ncs.com.sg." "2003-01-30 > > > 02:57:36" > > If the remote SMTP server does implement a RDNS query on your IP, and if > your IP does not have a valid PTR record it might slow down operations. > You should check from the same machine where the operation is slow, to > emulate the same SMTP session to look at which command the operation is > slow. > > > > - Davide > > - > To unsubscribe from this list: send the line "unsubscribe xmail" in > the body of a message to [EMAIL PROTECTED] > For general help: send the line "help" in the body of a message to > [EMAIL PROTECTED] - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
