Cover Letter Mistakes That Get Your Application Rejected

Why Cover Letters Get Rejected

Most cover letters fail for predictable, avoidable reasons. Hiring managers read hundreds of applications for a single opening, and they develop a sharp eye for low-effort letters. The mistakes below are not obscure edge cases — they are the errors that show up in the majority of rejected applications.

MIT’s Career Advising and Professional Development office warns candidates to “try not to simply repeat your resume in paragraph form, complement your resume by offering a little more detail about key experiences.” That advice alone, if followed, would fix half the cover letters written today. But there are nine more mistakes worth knowing about.

The 10 Most Common Cover Letter Mistakes

1. Using a Generic Template Without Customizing It

This is the single most damaging mistake. A letter that could be sent to any company for any role tells the hiring manager you did not take the time to understand their organization or the position. When the only thing you change between applications is the company name, it shows — and it leads directly to the rejection pile.

2. Repeating Your Resume in Paragraph Form

Your cover letter is not a narrative version of your resume. The hiring manager already has your resume. If your cover letter simply restates the same information in sentence form, you have wasted your opportunity to add context, show personality, and explain why your experience matters for this specific role.

3. Writing Too Much

A cover letter should be one page, typically 250-400 words across three to four paragraphs. Anything longer signals that you cannot communicate concisely — which is itself a red flag. Hiring managers skim. If your letter is dense and sprawling, the key points get buried and nothing lands.

4. Forgetting to Proofread

A single typo, a wrong company name, or a grammatical error can end your candidacy. It may seem harsh, but when a hiring manager is choosing between 50 qualified applicants, small errors become easy disqualifiers. Carelessness in the cover letter suggests carelessness on the job.

5. Using a Weak Opening

“I am writing to apply for the position of…” is the most common opening sentence in cover letters, and it is the most forgettable. It wastes your first impression on information the hiring manager already knows. Your opening sentence should make the reader want to read the second sentence.

6. Being Vague About Your Qualifications

Statements like “I am a hard worker” or “I have strong communication skills” mean nothing without evidence. Every candidate says these things. Without a specific example or result to back them up, generic claims are white noise.

7. Not Addressing the Letter to Anyone

When you start with “To Whom It May Concern,” you signal that you did not spend 30 seconds looking up who to address. In many cases, the hiring manager’s name is on the job posting, the company website, or LinkedIn. When you genuinely cannot find it, “Dear Hiring Manager” is the acceptable alternative.

8. Talking Only About What You Want

“This position would be a great opportunity for me to grow my skills” centers the letter on your needs, not the employer’s. Hiring managers want to know what you bring to them — how you will solve their problems, contribute to their goals, and add value from day one. Frame everything from the employer’s perspective.

9. Including Irrelevant Information

Your cover letter has limited space. Every sentence about an unrelated hobby, a job from 15 years ago that has no connection to the role, or a personal detail that does not strengthen your candidacy is a sentence that displaces something more compelling. Be ruthless about relevance.

10. Skipping the Cover Letter Entirely

When a job posting says “cover letter optional,” many candidates skip it. That is a mistake. Submitting a tailored cover letter when it is optional differentiates you from candidates who took the path of least effort. It shows initiative and genuine interest in the role.

How to Fix Each Mistake

Each mistake above has a direct fix. Here they are, paired in order:

Fix for #1 — Customize every letter. Reference the company name, the specific role, and at least one detail about the organization (a recent project, a company value, a product you admire). If you cannot find anything specific to say about the company, you have not researched enough. The JobScoutly cover letter builder helps you create tailored letters for each application so you start with a strong foundation instead of a blank page.

Fix for #2 — Add context your resume cannot. Use the cover letter to explain the “why” behind your career moves, add detail to your most impressive achievements, or describe skills that do not fit neatly into resume bullet points. If a sentence appears on both your resume and your cover letter, cut it from the letter.

Fix for #3 — Cut ruthlessly. After writing your first draft, remove any sentence that does not directly support your candidacy for this specific role. If you are over one page, start by cutting the weakest example or the most generic sentence. Every word should earn its place.

Fix for #4 — Use a three-step proofread. First, run spell check. Second, read the entire letter aloud — your ear catches errors your eyes skip. Third, have someone else read it. Pay special attention to the company name, the hiring manager’s name, and the job title.

Fix for #5 — Lead with a hook. Open with a specific connection to the company, a relevant accomplishment, or a direct statement about why this role excites you. Your first sentence should differentiate you, not blend in.

Fix for #6 — Use specific evidence. Replace every vague claim with a concrete example. “I increased quarterly sales by 22% by redesigning the outreach process” beats “I have strong sales skills” every time. Numbers, outcomes, and specifics build credibility.

Fix for #7 — Find the name. Check the job posting, the company’s team page, and LinkedIn. If you find the name, use it: “Dear Ms. Rodriguez.” If you genuinely cannot find it after searching, “Dear Hiring Manager” is acceptable and professional.

Fix for #8 — Frame from their perspective. For every sentence in your letter, ask: does this tell the employer what I can do for them? Replace “This role would help me develop my project management skills” with “My experience managing cross-functional teams of eight would allow me to contribute to your project management goals immediately.”

Fix for #9 — Apply the relevance test. Before including any detail, ask: does this directly relate to a requirement or responsibility listed in the job posting? If the answer is no, cut it. Your letter is a highlight reel, not a comprehensive biography.

Fix for #10 — Always submit one. Treat “optional” as “recommended.” A tailored cover letter gives you an advantage over every candidate who skipped it. Even a short, well-written letter is better than no letter at all.

Cover Letter Checklist Before Sending

Use this checklist before you submit any cover letter. If you cannot check every box, revise before sending.

• The letter is addressed to a specific person or “Dear Hiring Manager”
• The company name and job title are correct and appear in the letter
• The opening sentence is specific and engaging, not generic
• The body connects your experience to the job requirements with concrete examples
• You have included at least one measurable result or specific achievement
• The letter is framed from the employer’s perspective, not just yours
• Every sentence is relevant to this specific role
• The letter is one page or shorter
• The font, margins, and header match your resume
• You have proofread for spelling, grammar, and correct names
• The file is saved as a PDF with a clear file name
• You have not repeated your resume — you have complemented it

Run your resume through the JobScoutly resume builder to make sure it pairs well with your cover letter, and use the JobScoutly cover letter builder to generate a tailored first draft that you can refine for each application.