[Exim] verify/callout

I am just working through the ACLs produced by convert4r4 to make sure they do what
I want and am considering adding /callout to my verify=recipient statement.

I only want the callout when the recipient is on one of the hosts on my network
which I am MX for. I am confident that these hosts will respond quickly. I do not
want to callout to arbitrary hosts which may take an age to respond.

Does that mean I have to use two verify=recipient statements:

require verify = recipient
accept domains = ! +hosts_i_mx_for
require verify = recipient/callout

If so, it seems rather wasteful.

Phil.
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Phil Chambers (postmaster@???)
University of Exeter