Bug#401487: If primary MX is down, SEGFAULT

[Peter Chubb]

Package: exim4
Version: 4.63-11 



If I send email to a server whose primary MX is not accepting SMTP
connections, the smtp transport SIGSEGVs instead of trying the
secondary MX.

I'm sending to cse.unsw.edu.au

$ host -t mx cse.unsw.edu.au
cse.unsw.edu.au mail is handled by 102 blackhole2.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 103 blackhole.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 103 blackhole2.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 104 blackhole.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 104 blackhole2.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 1 barracuda.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 4 note.orchestra.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 4 tone.orchestra.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 100 blackhole.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 100 blackhole2.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 101 blackhole.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 101 blackhole2.cse.unsw.edu.au.
cse.unsw.edu.au mail is handled by 102 blackhole.cse.unsw.edu.au.


exim4 chooses to send to barracuda (which runs spam filtering of
various sorts)

>From exim4/mainlog:
2006-12-04 12:27:34 1Gr1w7-0005qJ-Bs barracuda.cse.unsw.edu.au [129.94.175.101] 
Connection refused
2006-12-04 12:27:35 1Gr1w7-0005qJ-Bs == foo at cse.unsw.edu.au R=dnslookup T=
remote_smtp defer (-1): smtp transport process returned non-zero status 0x000b: 
terminated by signal 11