On Mon, 31 Mar 2008, System Support wrote:
> Since then, I have had 4 out of several hundred outgoing e-mails 
> rejected with '553 sorry, your envelope sender is invalid ..' These are 
> to distribution addresses that worked last week.  All 4 do seem to be 
> going to mail servers in the same subnet.

dkim-filter doesn't know the envelope sender (specifically, the 
mlfi_envfrom() callback receives it as a parameter but doesn't use it) and 
also doesn't change it (specifically, there's no call to mlfi_chgfrom() 
nor does the filter request permission to do so from the MTA).

Moreover, if the filter were changing the envelope sender, there would be 
something logged to that effect.

> I have also discovered that the relays.ordb.org spam blacklist which has 
> been inactive for over a year started listing the entire world as 
> spammers this weekend.  I do not know if this is related.  It did cause 
> me other problems.

I'd say something like that is the more likely cause.

Anyone else having this (or a similar) problem?

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