and the smell is not pleasant. How should I address this?

Some options:Tell them that your boss has just complained about somebody in another team at your company having B.O. and that you find it disgusting and disgraceful that someone at your company should let the reputation of the business down with poor hygiene. Alternatively, send them an anoymous gift of deodorant with a message saying they stink and need to address the situation.

Yup - the old bar of soap in the Pocket trick usually works a treatOther one is to loudly exclaim, as you walk in the room "Whoo, have the drains blocked up again in here ???"

...or just don't say anything, but go into client meetings with a clothes peg on your nose and behave as if there isnt a problem. :K)

Vick's Vapour Rub.