On 31 Aug 2005 at 8:23, Marc Perkel wrote about
    "Re: [exim] Blocking non-existant Do":

|...
| verify = sender
| 
| reallyjust checks to see if the domain exists?

Short answer: yes, for non-local addresses.

Long answer:  As described in section 39.30, what happens is that the 
address is run through your routers in verify mode.  If any router 
accepts, verification succeeds.  In *typical* configurations, non-
local addresses will be accepted by a dnslookup router as long as the 
domain part has a valid MX or A record.  Local addresses will 
generally be accepted by the local delivery router only if the 
username is valid as well.

- Fred





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