Re: [Exim] Delivery failure to fedex.com

At 10:01 -0400 5/14/01, Daniel Einspanjer wrote:
>There was no new information in the debug info. Just that it looked up
>the MX records for fedex.com, it found all three (with the multiple IP
>addresses for each) and tried all possible IP's for the first two MX's but
>not the third.

I would guess that you are being tripped by:

hosts_max_try (smtp)

Type: integer
Default: 5

This option limits the number of IP addresses that will be tried for any
one delivery. Some large domains have very many MX records, each of which
may refer to several IP addresses. Trying every single one of such a long
list does not seem sensible; if several at the top of the list fail, it is
reasonable to assume there is some problem that is likely to affect all of
them. The value of hosts_max_try is the maximum number of IP addresses that
will actually be tried; any that are skipped because their retry times have
not arrived do not count.


----
In particular, the last part probably gives the reason that the third MX is
eventually tried.

You might try a rather larger value than 5 and see whether the behavior
changes (you may also want to then cut back until you find the smallest
"working" number [or compute what it should be based on the Fedex MX
results]).