> For starters, run amavisd with full debugging ($log_level = 5), or better
> still (to be able to capture stderr), run it without daemonizing:
>  # amavisd debug
>
> The last logged lines before a crash will give us a general idea
> in which area the problem occurs.

I did so before but never thought of setting max_servers to 1 which is much 
more useful than max_servers=25... :)

[r...@ns1 ~]# amavisd debug
[...]
Jan 18 16:47:12.007 ns1 /usr/local/sbin/amavisd[87055]: (87055-01) 
SpamControl: calling spam scanner SpamAssassin
Jan 18 16:47:12.008 ns1 /usr/local/sbin/amavisd[87055]: (87055-01) timer set 
to 800 s for SA (was 1200 s)
Jan 18 16:47:12.010 ns1 /usr/local/sbin/amavisd[87055]: (87055-01) calling 
SA parse, SA version 3.2.5, 3.002005, data as GLOB
Jan 18 16:47:12.018 ns1 /usr/local/sbin/amavisd[87055]: (87055-01) CALLING 
SA check
Segmentation fault: 11
[r...@ns1 ~]#

[r...@ns1 ~]# spamassassin -D -lint < email.txt
[...]
[88512] dbg: rules: ran body rule __NONEMPTY_BODY ======> got hit: "3"
[88512] dbg: rules: running uri tests; score so far=0
[88512] dbg: rules: compiled uri tests
[88512] dbg: rules: ran uri rule __DOS_HAS_ANY_URI ======> got hit: "w"
Segmentation fault: 11 (core dumped)
[r...@ns1 ~]#

Unfortunately I cannot find a core dump. Also, not sure if of interest, but 
if I remove the lines

Content-Type: multipart/alternative;
        boundary="----=_NextPart_756_F797_96266667.56376690"

the email gets processed. 


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