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

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Rodrigo Severo writes:

> Sam Varshavchik says:
>
>> If Courier cannot contact the primary MX it will automatically contact the
>> secondary MX.
>
> Is there any reason for Courier only try to contact a secondary MX if it
> can't contact the primary at all?

Why should Courier contact a secondary MX if it was perfectly able to reach
the primary?

> Wouldn't it be a good approach to try other MXs after any kind of error:
> failed connection, 4xx error, 5xx error etc?

When I see a sender repeatedly try to contact other MXs, even after being
told in no uncertain terms to 5xx-off, due to them being blacklisted, my
only response is typically a hardware firewall to such abusive and obnoxious
behavior.

> I'm recently having problems sending messages to several of my clients
> because they have MXs with one problem or the other: two top priority

So? Their MX is the one with the problem, not yours'.

> MXs and one of them is too busy, two top priority MXs and one of them is
> turned off (my client says it will only be turned on in case of
> emergency!!!) etc.

If it's turned off, and does not accept connection, Courier will go to the
backup MX. What's the problem?

> I know that some of these problems should be solved on the other end but
> I believe my suggestion is a more productive approach from Courier.

Accomodating technical incompetence is never productive in the long run.



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