[exim] lookup pgsql

Hi all,
how does exim respond to a pgsql query if the database is not reachable
due to network problem etc. occasionally?
Keeps the Query hanging, waiting?
Are there possible parameters to affect this behavior?

Many thanks
Rainer Sigl
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Rainer Sigl,                      | email: sigl@???
MPI f. extraterrestrische Physik, | phone: +49 (89) 30000-3557
Postfach 1312,                    | fax:   +49 (89) 30000-3569
D-85741 Garching, Germany         | web:   http://www.mpe.mpg.de/~sigl/