The project manager should have prepared acceptable communication channels to avoid the situation of a stakeholder not replying to emails due to intermittent Internet service. Acceptable communication channels are methods or modes of communication that are agreed upon by all parties involved in a project. They may include aspects such as email, phone call, text message, video conference, instant message, or face-to-face meeting. Acceptable communication channels can help to ensure that messages are delivered and received effectively and efficiently and that communication preferences and limitations are respected.