Now they are the 6 servers of Hotmail with Timed out. This goes of badly to worse. New.
mx2.hotmail.com. - 65.54.190.50 [Could not connect: Could not connect to mail server (timed out).]
mx3.hotmail.com. - 64.4.50.179 [Could not connect: Could not connect to mail server (timed out).]
mx3.hotmail.com. - 65.54.253.99 [Could not connect: Could not connect to mail server (timed out).]
mx4.hotmail.com. - 65.54.190.179 [Could not connect: Could not connect to mail server (timed out).]
mx4.hotmail.com. - 65.54.253.230 [Could not connect: Could not connect to mail server (timed out).]
mx1.hotmail.com. - 64.4.50.50 [Could not connect: Could not connect to mail server (timed out).]
<http://www.dnsreport.com/tools/[EMAIL PROTECTED]>http://www.dnsreport.com/tools/[EMAIL PROTECTED]
There are not 6 hotmail MXs timing out. There are only 4 MX hostnames, 1-4, each with 4 IPs, for a total of 16 IPs (and I bet those IPs are really load balancers rather than single machines)
;; ANSWER SECTION: hotmail.com. 72 IN MX 5 mx1.hotmail.com. hotmail.com. 72 IN MX 5 mx2.hotmail.com. hotmail.com. 72 IN MX 5 mx3.hotmail.com. hotmail.com. 72 IN MX 5 mx4.hotmail.com.
;; ADDITIONAL SECTION: mx1.hotmail.com. 1142 IN A 65.54.252.99 mx1.hotmail.com. 1142 IN A 64.4.50.50 mx1.hotmail.com. 1142 IN A 64.4.50.99 mx1.hotmail.com. 1142 IN A 65.54.166.99
mx2.hotmail.com. 1142 IN A 65.54.252.230 mx2.hotmail.com. 1142 IN A 65.54.166.230 mx2.hotmail.com. 1142 IN A 65.54.190.7 mx2.hotmail.com. 1142 IN A 65.54.190.50
mx3.hotmail.com. 1142 IN A 65.54.253.99 mx3.hotmail.com. 1142 IN A 64.4.50.179 mx3.hotmail.com. 1142 IN A 64.4.50.239 mx3.hotmail.com. 1142 IN A 65.54.167.5
mx4.hotmail.com. 1142 IN A 65.54.190.230 mx4.hotmail.com. 1142 IN A 65.54.253.230 mx4.hotmail.com. 1142 IN A 65.54.167.230 mx4.hotmail.com. 1142 IN A 65.54.190.179
The above setup, which is not original MS/hotmail approach (which used only one IP), is copied from AOL, which has been setup like that for years. Another example of MS following, not leading.
Our report is per MX, not per IP:
operation timed out (total: 8251)
201 mx3.hotmail.com
169 mx4.hotmail.com
97 mx1.hotmail.com
92 mx2.hotmail.com... where our SMTP timeout is set to 60 seconds (between SMTP commands/responses).
But mail is still going through to hotmail, eventually, at least with postfix's implementation of the MX algorithm and with BIND as postfix's DNS:
Host/Domain Summary: Message Delivery (top 30)
sent cnt bytes defers avg dly max dly host/domain
-------- ------- ------- ------- ------- -----------
1514 9735k 246 2.7 m 16.1 h aol.com
1180 5880k 198 56.0 s 16.5 h bellsouth.net
1103 6117k 2409 34.7 m 16.5 h cox.net
1088 7301k 123 56.7 s 16.2 h comcast.net
726 5585k 0 30.7 s 10.9 m earthlink.net
671 3196k 80 44.9 s 15.6 h sbcglobal.net
361 2383k 0 2.6 m 15.0 m hotmail.com <<<<<<<<<<<<<<<
357 1798k 0 42.5 s 10.8 m mindspring.com
340 1954k 0 1.8 m 23.9 m msn.comNote that the 2.6 minutes "average delivery delay" means that even when your MTA gets a connection to hotmail, hotmail is very slow in accepting your data, which isn't a problem Imail since I think Imail will wait almost indefinitely for SMTP progress (vs our 60 seconds setting). Imail's patience does mean that Imail can have a LOT of SMTP sessions in progress, perhaps to DoS levels. Being able to define your MTA's SMTP/D timeouts means you can protect it from being overloaded with slow-to-dead SMTP sessions.
If you aren't getting anything through to hotmail, then the hotmail problems are compounded by problems with your MTA's inefficiencies (or other local problems) in working the MX algorithm (or you are blacklisted). Another problem is that the NS used by Imail (eg, MS DNS) is not rotating or otherwise varying evenly the order of MX and A record-sets, so Imail's A queries are not getting answers distributed evenly across the full set of 16 IPs.
Len
____________________________________________________________________________ http://MenAndMice.com/DNS-training : Denver; NYC; San Jose
http://IMGate.MEIway.com : free anti-spam gateway, runs on 1000's of sites
To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
