Thanks Lizard, but I don't have control over who sends this particular emails.
If you can persuade the sender of these emails to tweak their format, you can use the following (lifted directly from the OmniFocus help):
To specify a project, use > (greater-than sign) or :: (double-colons), followed by a project name or abbreviation. The colons are nicer for the iPhone because they are on the first shifted keyboard rather than the math keyboard. The project string is matched exactly as if it was entered in a project cell in OmniFocus.
To specify a context, use @ (at sign), followed by a context name or abbreviation. Like project names, the context name is matched exactly as it would be in OmniFocus.