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<TITLE>Exim Filter Specification - Testing delivery status</TITLE>
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<H2><A NAME="SEC25" HREF="filter_toc.html#TOC25">Testing delivery status</A></H2>
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There are two conditions which are intended mainly for use in system filter
files, but which are available in users' filter files as well. The condition
<TT>`first_delivery'</TT> is true if this is the first attempt to deliver the
message, and false otherwise. In a user filter file it will be false only if
there was previously an error in the filter, or if a delivery for the user
failed owing to, for example, a quota error, or forwarding to a remote
address that was deferred for some reason.
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The condition <TT>`manually_thawed'</TT> is true only if the message was `frozen' for
some reason, and was subsequently released by the system administrator. It is
unlikely to be of use in users' filter files.
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