Marc Perkel wrote:
> This is a situation where you are sure that the recipient server should
> be accepting email but because of some failure is mistakenly returning
> 550 errors.
>
By absolute definition, the server returning a 5xx isn't making a
mistake. It's saying "This doesn't work for me, I give up, sorry" and
it's perfectly entitled to do so. You disagree with the interpretation,
that's absolutely your problem, not the receiving MTA and not exim's either.
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