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

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Rodrigo Severo writes:

> Sam Varshavchik wrote:
>
>>
>>
>> If there are equal priority MXes each attempt should go to a random MX.
>
> As I already said, if this is the current behaviour of Courier that's
> good. What I am suggesting here is that, if all top priority MXs were
> already tried, why not step to the next priority level and try to
> deliver the message to them? After all that's why they exist isn't it?

Right. And if Courier cannot contact the primary MX, it will then try to
contact one randomly-chosen next priority MX.

> scorsese rodrigo # telnet brsmtp04.br.abnamro.com 25
> Trying 200.208.15.131...
> Connected to brsmtp04.br.abnamro.com.
> Escape character is '^]'.
> 220 Welcome
> ehlo scorsese.fabricadeideias.com
> 250-br.abnamro.com
> 250-SIZE 6291456
> 250-ETRN
> 250-ENHANCEDSTATUSCODES
> 250-DSN
> 250-VRFY
> 250-AUTH
> 250 8BITMIME
> mail from: <FAKE1@fabricadeideias.com>
>
> and here the connection hangs.

Then you have your answer. Their mail servers are broken. There's nothing
that Courier can do here. Courier will not disconnect and reconnect to some
other MX. Courier will only try to contact the next MX if it didn't connect
at all to the first MX. Once a working MX is contacted, it is expected to
be able to receive and deliver a message. If any error occurs, Courier will
try again at some later point in time. To do anything else would be viewed
as abusive behavior, by many places.


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