Log message "qualify/rewrite: address is ridiculously long"

I've noticed recently some messages I haven't seen before in the logs:

qualify/rewrite: address is ridiculously long

I do agree with the sentiment (looking at one, the Reply-To address was an 
absurd 331 characters long), but slightly unclear if it's indicating that 
Exim's behaviour is changed as a consequence, or is this it intended merely as 
a general observation?

Out of interest, I looked at a few, and they all appeared to be marketing sent 
from various organisations via the Salesforce platform, which seems to have 
invented a ludicrously long token to data-harvest clicks to the target 
website, and uses a similarly-formatted token to form part of the Reply-To 
address. Brilliantly, this token partially consists of base64-encoded JSON(!), 
which in turn contains a very long opaque token and some kind of encrypted 
data, together with what appears to be the IV for it. Aside from being used in 
the Reply-To, a similar insanely-long token is included in *every single link* 
in the mail, of which there are tens. The mind boggles, to put it mildly.

(I really hope they have some good validation/error handling on the server 
side, when they load back in this untrusted, base64-encoded, 
partially-encrypted JSON...)


Tim



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