[exim] limit in redirect-router?

Hi exim folks,

I've got the following router here:

system_aliases:
driver = redirect
allow_fail
allow_defer
condition = ${if exists {/etc/maildomains/$domain}}
data = ${lookup{$local_part}lsearch{/etc/maildomains/$domain}}
file_transport = address_file
pipe_transport = address_pipe

now the lsearch would find a line like this:

alias1: address1@???, address2@???,
address3@???, ...

I have 2.500 addresses for that alias. Will this cause troubles when
sending to this alias? No worries about spamming-hubs and such, this
will be internal and can not be reached from the outside.

Your comments would greatly be appreciated;
thanks!

wogri

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