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A letter of support states clearly who or what you support, why, and what qualifies you to say so, with facts the reader can check. Vague praise helps no one. Name the person or cause, give one or two concrete examples, and say exactly what you are asking the reader to do.
Support letters cluster into four kinds, and each has a different reader. A personal support letter backs someone you know, for a job, a visa application, a school place, or a community role: the reader wants to know how you know the person and what you have seen them do. A professional reference supports a colleague or employee in similar terms, but with work examples. A cause letter supports a project, a grant, or a community proposal: the reader wants evidence the project matters and can succeed. A character letter, often written for a court or an official process, speaks to the person's conduct and reputation. The shared rule: the reader is deciding something, and your letter is evidence, not decoration. Write like someone whose words will be weighed, because they will be.
| Kind | Reader | Strongest evidence |
|---|---|---|
| Personal support | Employer, school, immigration officer | How long you have known them, and one observed example |
| Professional reference | Hiring manager, licensing body | Specific work results you saw firsthand |
| Cause or grant support | Funder, council, committee | Community need plus the project's track record |
| Character letter | Judge, official, panel | Honest conduct examples, including flaws owned plainly |
Start with your own standing: your full name, your role or relationship, and how long you have known the person or the cause. "I have supervised Ana for three years at our clinic" carries weight that "Ana is wonderful" never will. Then give one or two concrete examples tied to the decision at hand: a project completed, a difficulty handled well, a commitment kept over time. Dates, places, and roles make examples checkable, and checkable examples are what persuade a reader. State any limits honestly too: if you know the person only socially, say so, and stick to character rather than claiming work knowledge you do not have. Readers trust a letter more when it admits its limits than when it claims everything. Do not exaggerate, and do not include claims you cannot back up if asked: a support letter with one false detail casts doubt on all the true ones.
End by saying exactly what you support and what you ask the reader to do: approve the application, grant the funding, consider the candidate, or weigh the letter in their decision. A vague close ("I hope you will look favourably on this") wastes the letter's momentum. A clear close names the outcome and offers to be contacted: "I support this application and am happy to discuss it further at the number below." Include your phone number and email address, and sign with your full name and title. If the letter goes to a court or government office, check whether that body has a format or deadline for support letters first, since some do, and a letter that misses the format may not be counted. Keep a copy for yourself, with the date sent.
Never invent qualifications, dates, or achievements for the person you support: that is misrepresentation, and it can harm their case if discovered. Never include sensitive personal data about the person, like medical details, immigration file numbers, or financial records, unless the receiving body specifically asks for it and you have the person's consent. Never attack the other side in a dispute: a support letter that insults opponents reads as biased and weakens the support itself. Never promise an outcome you cannot control, and never sign a letter you did not write or agree with. If someone asks you to sign a pre-written letter you do not fully endorse, rewrite it in your own words or decline. Your name on the letter is your credibility, and lending it carelessly spends it.
For mailing, a typed support letter on plain paper in a standard envelope is the norm. LetterAgent can print and mail such a letter to a US or Canadian address from a chat with your AI assistant, with the price quoted up front and approved by you before anything is sent. For formal or time-sensitive support letters, tracked delivery (US Certified Mail or Canada Registered Mail) gives you proof the letter arrived.
Ready to mail it? Send your letter with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is printed and mailed.
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