Viktor Dukhovni:

POODLE is not an SMTP attack.  No need to panic.  Disabling SSL
3.0 may feel good, but the net effect is slightly negative, since
you'll now use cleartext with SSLv3-only SMTP peers.

to calculate the damage, count:

< inbound >
# grep 'TLS connection established from' /var/log/mail | sed -e 's/^.*\]\: //' -e 's/ with cipher.*//' | sort | uniq -c

< outbound >
# grep 'TLS connection established to' /var/log/mail | sed -e 's/^.*\]:25\: //' -e 's/ with cipher.*//' | sort | uniq -c

Andreas

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