[courier-users] Re: Automatically use secondary MX host if primary fails

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Rodrigo Severo writes:

> 1. Courier gets some 4xx error. There are other MXs available but as far
> as I can Courier tries the same MX several times if not all the time so
> message delivery is unnecessarily delayed or delivery even fails.
> Wouldn't it be better to try other MXs (same or different weights) in a
> round robin or similar fashion in every delivery attempt (obviously
> respecting weight precedence)?

No. This is abusive behavior. If I see someone banging on all of my MXes
despite being told to go away, they get firewalled as a likely spam spew
source.

> 2. Courier's connection to the other server times out so it defferes
> message delivery. There are other MXs available but as far as I can
> Courier tries the same MX several times if not all the time so message
> delivery is unnecessarily delayed or delivery even fails. Wouldn't it be
> better to try other MXs (same or different weights) in a round robin or
> similar fashion in every delivery attempt (obviously respecting weight
> precedence)?

If there are equal priority MXes each attempt should go to a random MX.

>
> scorsese Maildir # dnsmx br.abnamro.com
> 30 plum03ap.abnamro.com
> 30 walnut001ap.abnamro.com
> 10 brsmtp02.br.abnamro.com
> 10 brsmtp04.br.abnamro.com
> 15 naxpf001.abnamro.com
> 15 naxpf002.abnamro.com
> 15 naxpf003.abnamro.com
> 15 naxpf011.abnamro.com
> 15 naxpf012.abnamro.com
> 15 naxpf013.abnamro.com

I don't have any issues connecting to these MXes. Sounds to me like you
have a networking problems.


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