iChain Email Issue

[rseale]

We've got a vendor that sends confirmation Emails to a large number of
our users after a registration process. The Email being sent has a
confirmation link that the users are supposed to click on.

Our server versions:
iChain 2.3 Sp5 in front of NetMail 3.52f

The confirmation link sent follows this format:
https://www.url.com/reference.dca?cd...m&iigg=MD5HASH

iChain is rewriting it as:
https://www.url.com/reference.dca?cd...m-iigg=MD5HASH

Notice before iigg, the & was rewritten as -

I have come to the conclusion that the issue is likely because the
message was sent in plain text and the & is being rewritten to avoid an
error. I have since turned on the custom rewriter for the url string
and fixed the issue.

Is there a way the vendor can reformat the link so it doesn't get
tripped up? I don't want to have to support the rewriter because every
time someone checks their Email(which isn't cached), the rewriter is
scanning their messages...

Thanks,

--Ryan