On Wed, 21 Feb 2018 16:48:40 +0000
Anthony Cartmell <ajcartm...@fonant.com> wrote:

> If you mean following URLs in messages, you do need to be aware that
> this can break one-time login links.

Big time.  That's why you only want to do it for URLs that are
absolutely known to be shortened URLs.  You have to keep a list of
known URL-shorteners.  It's hard/impossible to get a complete list,
but pretty easy to get a list of the big ones that cover 90% of all
shortened URLs you're likely to see.

Regards,

Dianne.

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