A federal agency states that it requires the user to submit a request via its online portal.
Thank you very much for your note and your suggestion that we use the agency's online portal for our request and future requests.
However, we decline to make use of FOIAonline because it is less convenient for us.
Rather, we will ask that you process our request, and follow the rules and procedures of this agency's regulations, which do not specify that the agency will accept not accept requests by email.
Most agencies regulations do not state that they can require users to use a portal. FOIA offices must comply with their current regulations as well as federal law around accepting and processing requests.