I just ran into a job posting that ends with sentence "A presentation letter and references are frowned upon". That seemed rather unusual to me, since what I usually found is that presentation letter and references are often required or at least encouraged.
I'm not asking for advice because I'm not going to apply for this offer but I'd like to know if this is usual and what may be the reason to discourage sending a cover letter.
Edits in response to comments:
The whole last paragraph of the document is:
Please send your application to the Human Resources board at [e-mail deleted]. Expertise should be certified. A presentation letter and references are frowned upon.
I'd like to link to the actual document, but since it was sent to me as a google docs link I don't know if it's public.
About job offer/job posting, I suppose "posting" would be more appropriate, because they are looking for candidates although neither the company, nor the person who forwarded the document to me nor myself are native English speakers nor based in an English speaking countries and I'm afraid we have been misusing the terms.
I found the posting in a public web with a quite similar wording - not exact. It's here.