I've been looking around and apparently, writing emails is the least effective way to communicate to an MP.
Writing a letter is one of the better methods that can be done within a day, but if you can arrange a meeting, that is best. Tips for writing letters:
>Include your name and address: Identify yourself as a constituent by including your address when you write to your elected representative/s. Generally, politicians are likely to pay most attention to people who live in their electoral district.
>Keep it brief: Letters should be no longer than one page and should be about one issue only. Be as concise as possible. Politicians receive many letters on many topics every day. Long letters are likely to be put aside to read on a less busy day and that day may never come.
>Use your own words, not someone else's: An original letter sent by one single person is more effective than a form letter (or cut and pasted texts) sent by dozens of people. Even if your writing skills are not the best, a letter written in your own words will carry much more weight than regurgitating what some else said.
>Handwrite, or type and sign, your letter: A handwritten, or typed and signed, letter is far more effective than photocopied form letters, postcard campaigns or emails. Some politicians regard handwritten letters more highly than typewritten letters (some of these are technologically illiterate, and some find it convenient to claim the sender probably just cut and pasted what someone else said without thinking about the issue themself). Some, very likely many, regard emails as "second class mail" and some do not even read email.
>State the topic clearly: Include a subject line at the beginning of your letter. If it is about a specific piece of legislation (an Act) or a proposed law (a Bill), state the full name of the Act or Bill in the subject line, or at least in the first paragraph.
>Start with a clear statement of purpose: For example:
>"I am writing to urge your support for / opposition to…"
>"I am writing to ask you to support / oppose …"
>Focus on three important points: Choose the three points that are most likely to be persuasive in gaining support for your position and flesh them out. This is more effective than attempting to address numerous points in a letter.
>Ask your representative to take concrete action: For example, in relation to a proposed law (a Bill), ask them to raise the matter in their party room and seek to have their party oppose the Bill. Point out that the issues are important enough to warrant amendments to the Bill, and/or for the representative to cross the floor and vote against the Bill if their party supports it.
>Ask for a response to your letter: While the response will usually be a form letter, written and authorised by their political party, you will know you have had an impact on their office. Party politics in Australia are such that few elected politicians are likely to tell you whether or not they personally share your views/position. However, a well-written letter can be instrumental in prompting them to take action behind the public scenes to inform and potentially change their political party's position.
>Personalise your letter: When possible, include a personal story and/or information on how the issue affects you, your family, your business, or people around you. This can help your representative understand your position and can be very persuasive as he/she forms a position on an issue. The more personal your letter, the more impact it is likely to have.
>Personalise your relationship: If you have ever voted for the representative, or contributed time or money to their election campaign, or have met them, etc, say so. The closer your representative feels to you, the more effective your letter is likely to be.
>Be polite: Be courteous, but don't be afraid to take a firm position. While your representative's job is to represent you, remember that politicians and their staff are people too. Threats, hostile remarks and rude/offensive language are among the fastest ways to alienate people who could otherwise decide to support your position in light of rational and reasoned argument. Your representative could be in elected office for decades, and could be promoted to higher, more influential, office within their party. Avoid creating enemies.
>Thanks is as important as criticism: Politicians/political parties need to be able to tell the 'other side' that they have been inundated with calls and letters supporting their position. Write thank you letters to politicians/parties that you know support your position. This will encourage them to stand firm on their position rather than backing down, which has often happened during the passage of proposed laws through Australian parliaments.
>Keep the irritation factor low: Avoid accusing/criticising the wrong politicians/party. Politicians, like anyone else, may become irritated when accused of holding views they do not. If you are not sure of the views of the person or political party you are contacting, either research the matter, ask them, or just inform them of your views and why they should support same.
Source: https://www.efa.org.au/Campaigns/lobby.html#tipsletter