atom feed7 messages in net.sourceforge.lists.courier-usersRe: [courier-users] Re: Blocked spam ...
FromSent OnAttachments
Alessandro VeselyJul 10, 2002 11:17 pm 
Sam VarshavchikJul 11, 2002 4:11 am 
Mark ConstableJul 11, 2002 5:24 am 
Binand Raj S.Jul 11, 2002 6:37 am 
Mark ConstableJul 11, 2002 6:51 am 
Alessandro VeselyJul 11, 2002 7:56 am 
Andrew NewtonJul 11, 2002 9:37 am 
Subject:Re: [courier-users] Re: Blocked spam comes back through 2nd MX
From:Binand Raj S. (bin@gmx.net)
Date:Jul 11, 2002 6:37:48 am
List:net.sourceforge.lists.courier-users

On Thursday 11 July 2002 06:52 pm, Sam Varshavchik wrote:

Yeah, so the secondary's going to try to immediately contact the primary, which is temporarily unavailable (obviously), so the secondary is going to defer the mail, and try again later. The mail that you see off the secondary is from the secondary's redelivery attempt.

At my workplace, we have two domains setup where a secondary MX might be of use.

1. For one domain, a machine has two network interfaces, whose IP addresses are the two MXes of that domain.

2. For the other domain, the two MXes (running sendmail) pass incoming emails off to a third server where all mailboxes are hosted, to be retrieved by users via POP/IMAP/whatever.

In both cases, the two MXes point to IPs hosted on different ISPs; and we do have not very infrequent downtimes on either. ISPs in India aren't exactly well known for their reliability ;-) As I see it, for domain 1, the second MX helps only when a link goes down, but for domain 2, it helps even if one of the MXes goes down too.

Binand