[exim] timeout for av_scanner?

Hello,

does anybody know about some timeout for av_scanner? We have some huuge mails
sitting in our queue, exim tries to retransmit them, on the receiving side is
some exim running too. (Both 4.63). But these messages don't go through.

    # global
    av_scanner = clamd:/var/run/clamav/clamd.ctl

    begin acl
    ...
    acl_check_data:
    deny    malware    = *
            message    = This message contains a virus ($malware_name).\r\n\
                         CONTACT

But with huuge messages (42MB) clamav seems to timeout:

    07:49:31 [25911] 1HTBay-0006jv-T4 malware acl condition: \
                     clamd: unable to read from socket (Connection timed out)

Which of exims timeout settings bites me here? (is the local_scan_timeout used?)

Thanks in advance.

    Viele Grüße aus Dresden
    Heiko Schlittermann
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