On Fri, 16 Nov 2018 08:48:56 -0800
Ian Zimmerman wrote:

> 1. Am I correct in assuming that SA decodes base64 MIME parts so it
> does act on these links?  Reading the -D output surely indicates so.

I think you've already answered that.
 
> 2. I remember some discussion here about following shortener links
> like bitly.  What is the resolution of that?  Does SA currently (as
> of 3.4.2) follow such links, to see (for example) that the link in my
> spample led to Facebook?
 
See

https://github.com/smfreegard/DecodeShortURLs

but Facebook isn't going to be listed anywhere. There is a test for
bitly links that have already been blocked.

> 3. The documentation for the HashBL plugin shows how to set it up to
> check addresses from headers.  Is there a way to also check addresses
> from mailto links in the body?  

It's already supposed to do that. It doesn't actually say it only
checks headers.

If you are thinking of:

header   HASHBL_EMAIL       eval:check_hashbl_emails('ebl.msbl.org')

AFAIK that 'header' is just a matter of syntax and  taxonomy and the
only practical difference it makes is that HASHBL_EMAIL's score counts
towards the 3 header points needed for auto-learning.

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