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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