On Fri, 02 Feb 2018 16:52:16 +0000
Ken O'Driscoll via mailop wrote:

> On Fri, 2018-02-02 at 17:26 +0100, Chris wrote:
> > I'm a bit surprised, that on a small mail server, 77 % of the
> > rejected mails are rejected because of invalid recipient adresses.
> > 22 % because of DNSBL.
> > 
> > Is this ratio normal?  
> Assuming you're talking about inbound emails and wondering why more
> mails aren't being caught by RBLs.

Yes, inbound. I'm wondering why there are so many mails to
not-existing recipients.

> It depends on the domains hosted on the box (age and overall
> exposure), what RBLs you employ and, crucially, the order in which
> your MTA processes things - i.e. does the address check occur before
> the RBL tests etc.

Yes, address check is before RBL. The domain is probably in use since
1998. RBL is mostly spamhaus.

- Chris

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