Read this order
Mountain → Letter: An obstacle or delay may take written or documented form.
What changes in reverse?
Letter → Mountain: A message or document held up: a delayed reply, blocked delivery or paperwork that is not progressing.
Letter → Mountain ↗A practical example
Paperwork waiting for a required signature gives this pair a concrete setting. The Letter identifies the written item; Mountain points to what stops its progress. A delay alone does not tell you whether the eventual answer is favorable.
Check it against your question
Keep the actual order and ask which part of the example fits your situation. An example illustrates a possible reading; it does not establish facts or promise an outcome.
The meanings behind the pair
Mountain: Mountain is a substantial obstacle, blockage or delay. It shows where movement is difficult; other cards may indicate whether a route around it is available.
Letter: Letter is a written message, document, notice or record. It draws attention to the information itself and to how it has been communicated.
These examples show possible ways to read the pair. Your question and the other cards may change the meaning.