[exim] exim opening multiple connections to database

Hi,

I have nearly all my configuration parameters for exim in a postgresql database. That is for example, the local domains, email adresses and some tables for spamcheck with spamassassin. Also spamassassin itself stores its configuration, auto-whitelist and bayesdb in a database.

Now I tried to test my spamfilter with 150 spammails. When doing this postgresql rejects a lot of connections because of its maximum connection limit. This connection limit is set to 100 concurrent connections, so I am quite sure that this shouldn't happen. spamassassin opens no more than 5 processes and therefore should not open more than five connections to the database.

How does exim do this? I bounced all 150 spam messages all at once to one address. Does exim process these mails in parallel? The postgresql log for 1 mail looks like this:

2005-05-19 10:29:10 [19298] LOG: connection received: host=[local] port=
2005-05-19 10:29:10 [19298] LOG: connection authorized: user=mail database=soutdb
2005-05-19 10:29:15 [19301] LOG: connection received: host=[local] port=
2005-05-19 10:29:15 [19301] LOG: connection authorized: user=mail database=soutdb
2005-05-19 10:29:15 [19303] LOG: connection received: host=[local] port=
2005-05-19 10:29:15 [19303] LOG: connection authorized: user=mail database=soutdb
2005-05-19 10:29:15 [19308] LOG: connection received: host=[local] port=
2005-05-19 10:29:15 [19308] LOG: connection authorized: user=spamassassin database=spamassassin
2005-05-19 10:29:15 [19309] LOG: connection received: host=[local] port=
2005-05-19 10:29:15 [19309] LOG: connection authorized: user=spamassassin database=spamassassin
2005-05-19 10:29:15 [19310] LOG: connection received: host=[local] port=
2005-05-19 10:29:15 [19310] LOG: connection authorized: user=spamassassin database=spamassassin
2005-05-19 10:29:22 [19313] LOG: connection received: host=[local] port=
2005-05-19 10:29:22 [19313] LOG: connection authorized: user=spamassassin database=spamassassin
2005-05-19 10:29:22 [19314] LOG: connection received: host=[local] port=
2005-05-19 10:29:22 [19314] LOG: connection authorized: user=spamassassin database=spamassassin
2005-05-19 10:29:22 [19317] LOG: connection received: host=[local] port=
2005-05-19 10:29:22 [19317] LOG: connection authorized: user=mail database=soutdb
2005-05-19 10:29:22 [19318] LOG: connection received: host=[local] port=
2005-05-19 10:29:22 [19318] LOG: connection authorized: user=mail database=soutdb
2005-05-19 10:29:22 [19320] LOG: connection received: host=[local] port=
2005-05-19 10:29:22 [19320] LOG: connection authorized: user=mail database=soutdb

connections to soutdb are done by exim, connections to spamassassin are done by spamassassin.

Any idea why the connection limit is hit?

Regards
Marco