Steve,
They may very well have some load balancing going on, but that is something
they need to do on their end. When we connect, we connect to an IP address.
If there is only one IP address, it is their onus to load balance.
As far as I can tell, this trick of theirs actually fools deliverying
servers into retrying more frequently rather than waiting. As it is right
now, we'd timeout after 10 minutes and go to the next and the next, but if
we fail the e-mail, we retry 6 hours later.
--- Noel
-----Original Message-----
From: Steve Short [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 20, 2002 11:38
To: James Developers List
Subject: RE: Lots of twisty, er, servers all the same ...
Not sure about this, but they may be doing some kind of load balancing.
I'd suggest not condensing the MX records based on IP address.
Steve
> -----Original Message-----
> From: Noel J. Bergman [mailto:[EMAIL PROTECTED]]
> Sent: Monday, August 19, 2002 8:48 PM
> To: James-Dev Mailing List
> Subject: Lots of twisty, er, servers all the same ...
>
>
> As you can see from the nslookup of ATT.NET that follows,
> they have lots of MX records, all the same IP address. On
> nights like tonight when AT&T is jammed, this can block a
> delivery thread for over an hour.
>
> Is there a reason why getMailServers [actually,
> DNSServer.findMXRecords()] should not return a collection
> containing only one entry per IP address?
>
> --- Noel
>
> > set q=mx
> > att.net
> Server: MACU.MA.MT.NP.ELS-GMS.att.net
> Address: 199.191.145.136
>
> att.net MX preference = 5, mail exchanger = gateway1.att.net
> att.net MX preference = 5, mail exchanger = gateway2.att.net
> att.net MX preference = 5, mail exchanger = gateway3.att.net
> att.net MX preference = 5, mail exchanger = gateway4.att.net
> att.net MX preference = 5, mail exchanger = gateway5.att.net
> att.net MX preference = 5, mail exchanger = gateway6.att.net
> att.net MX preference = 5, mail exchanger = gateway8.att.net
> att.net nameserver = ohcu.oh.mt.np.els-gms.att.net att.net
> nameserver = macu.ma.mt.np.els-gms.att.net att.net nameserver
> = orcu.or.br.np.els-gms.att.net att.net nameserver =
> wycu.wy.br.np.els-gms.att.net
> gateway1.att.net internet address = 204.127.134.23
> gateway2.att.net internet address = 204.127.134.23
> gateway3.att.net internet address = 204.127.134.23
> gateway4.att.net internet address = 204.127.134.23
> gateway5.att.net internet address = 204.127.134.23
> gateway6.att.net internet address = 204.127.134.23
> gateway8.att.net internet address = 204.127.134.23
> ohcu.oh.mt.np.els-gms.att.net internet address = 199.191.144.75
> macu.ma.mt.np.els-gms.att.net internet address = 199.191.145.136
> orcu.or.br.np.els-gms.att.net internet address = 199.191.129.139
> wycu.wy.br.np.els-gms.att.net internet address = 199.191.128.43
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