This bug was originally reported here, sorry for now upstreaming it earlier:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=137629

Description of problem:
Evolution seems to think the text "gnome-fs-ftp.png" should be a link.
Specifically, the "ftp.png" part - "ftp://ftp.png". It seems pretty
obvious that this should not be a link to me. 

Here are some possible criteria to consider for the following
question: Should this string be a link, even though it lacks a
protocol prefix (like 'http://') and any slashes?
- NO if there are less than 2 dots in it (skip things like www.foo,
ftp.foo)
- NO if there is random junk before it (like 'gnome-fs-')
- NO if the characters between the last dot and the end of the string
are on a blacklist of common file extensions (but what about .COM files ;)
- YES if the characters between the last dot and the end of the string
are on a whitelist of valid TLDs

Obviously, the last criterion would be both slow and a pain to
maintain, and the third one would be highly subjective. Personally, I
like the first two... any ideas?

Version-Release number of selected component (if applicable):
Originally seen with evolution-2.0.2-3 on Fedora
Confirmed with evolution-2.5.2-1 on Fedora

Screenshot of the problem:
https://bugzilla.redhat.com/bugzilla/attachment.cgi?id=105958

Last time I checked, code in e-utils/e_text_to_html_full does a 
!strncasecmp (cur, "ftp://", 6) 
which ought to work properly, so I suspect something else is at fault here;
haven't yet tried single-stepping through the logic though.