8 Cover Letter Mistakes That Get You Rejected (And How to Fix Them)

Hiring managers don't reject cover letters because candidates are unqualified. They reject them because the letters are bad. And they're bad in predictable, fixable ways.

After reviewing thousands of applications, recruiters report the same patterns: generic openings, walls of text, rehashed resumes, and tone-deaf pitches. The candidates might be great. But their cover letter killed them before anyone bothered to find out.

This article covers the 8 most common cover letter mistakes — the ones that consistently move applications from "maybe" to "no" — and shows you how to fix each one.

Mistake 1: The Generic Opener

What it looks like:

"Dear Hiring Manager, I am writing to express my interest in the Marketing Manager position at your company. I believe my skills and experience make me a strong candidate for this role."

Why it kills your application:

This opening could be attached to any job at any company. It tells the recruiter nothing — except that you didn't care enough to personalize. When a hiring manager reads 50 of these in a row, they all blur into the same forgettable letter.

The fix:

Open with something specific — about the company, the role, or the connection between their needs and your experience.

"When I saw Acme is building a content team to support its push into enterprise, I immediately thought of the content engine I built at [Previous Company] — the one that went from zero to 200K monthly organic visitors in 18 months."

The first sentence should make it clear this letter was written for this job. If you can swap the company name and reuse it, it's not specific enough.

Mistake 2: The Resume Rehash

What it looks like:

"In my role as Product Manager at Acme Corp, I managed a cross-functional team of 8, led the launch of 3 major features, and improved user retention by 15%. Prior to that, I was an Associate PM at Beta Inc, where I..."

Why it kills your application:

The recruiter already has your resume. Reading the same information in paragraph form adds nothing and wastes their time. A cover letter that duplicates the resume signals that you don't understand the purpose of either document.

The fix:

Your cover letter should add context that the resume can't convey. Pick your most relevant experience and go deeper — the challenge, your approach, the insight, and why it matters for this role.

"The 15% retention improvement on my resume doesn't tell the full story. When I joined, the team was focused on new feature shipping speed as the primary metric. I pushed to add a retention cohort analysis, which revealed that users who completed onboarding within 48 hours retained at 3x the rate. That single insight redirected the roadmap."

Same achievement. New information. Added value. For more on the tools that help you get this right, see our cover letter tools comparison.

Mistake 3: Too Long

What it looks like:

A full-page letter — 500, 600, 800 words — that covers your entire career history, your philosophy on work-life balance, your long-term career goals, and a detailed analysis of the company's market position.

Why it kills your application:

Nobody reads a long cover letter. Recruiters are scanning hundreds of applications. If your letter requires scrolling, the recruiter is already forming a negative impression before they start reading. Length signals poor communication skills — an inability to prioritize and be concise.

The fix:

250–350 words. Four paragraphs. That's it. Every sentence must earn its place. If a sentence doesn't directly contribute to your argument for being hired, delete it.

A useful test: after writing, go back and remove every sentence that starts with "I believe," "I feel," or "I think." These almost always add length without adding substance.

Mistake 4: Wrong Tone

What it looks like:

Either too formal: "I wish to humbly submit my application for your esteemed consideration and would be deeply grateful for the opportunity to contribute to your distinguished organization."

Or too casual: "Hey! Saw your job post and thought I'd shoot my shot. I'm pretty awesome at marketing and think I'd crush it on your team lol."

Why it kills your application:

The overly formal tone makes you sound like you're writing in 1985. The overly casual tone makes you sound like you're not taking the opportunity seriously. Both create distance between you and the reader.

The fix:

Write like a competent professional having a conversation. Imagine you're emailing a respected colleague you've met once — someone you want to impress but don't need to grovel to. Professional but natural. Confident but not arrogant.

"Your engineering team's approach to observability — the recent blog post about distributed tracing — resonated with me. I've spent the last two years building monitoring systems at [Company], and the problems you're solving are exactly what I want to work on next."

Natural. Specific. Professional without being stiff.

Mistake 5: No Evidence

What it looks like:

"I am a highly motivated, results-driven professional with excellent communication skills and a proven track record of success. I am adept at problem-solving and thrive in fast-paced environments."

Why it kills your application:

This is a list of claims with zero evidence. "Results-driven" means nothing without results. "Proven track record" is unproven unless you prove it. These phrases are filler — they take up space but convey no information.

The fix:

Replace every adjective with a fact. Replace every claim with evidence.

Don't say	Say instead
"Results-driven"	"Grew ARR from $2M to $5M in 18 months"
"Excellent communicator"	"Presented quarterly business reviews to the C-suite"
"Strong leader"	"Managed a team of 6 across 3 time zones"
"Problem solver"	"Identified and fixed a billing bug that was costing $40K/month"
"Passionate about"	[Delete and replace with a specific detail about the company]

Numbers are proof. Adjectives are noise.

Mistake 6: Not Addressing the Company

What it looks like:

A letter that talks entirely about the candidate — their experience, their skills, their goals — without any reference to the company, the team, or the role's specific challenges.

Why it kills your application:

It signals that you're mass-applying. The recruiter thinks: "This person doesn't care about us — they care about getting a job." In a competitive market, that's not enough. Companies want people who want them, not people who want anyone.

The fix:

Dedicate at least one paragraph (or a few sentences woven throughout) to why this company. Reference something specific:

• A recent product launch, funding round, or company milestone
• Something from their engineering blog, podcast, or social media
• Their stated values or approach — but only if you can connect it to your own experience
• A specific challenge mentioned in the job description

You don't need extensive research. Ten minutes on the company website and a quick news search is enough to find one genuine, specific detail. For a faster approach, see how to write a cover letter in 30 seconds with AI.

Mistake 7: Apologizing for What You Lack

What it looks like:

"While I don't have direct experience in enterprise sales, I am a quick learner and am confident I can pick it up."

"I know you're looking for someone with 5+ years of experience and I only have 3, but I believe my enthusiasm and work ethic make up for the gap."

Why it kills your application:

You've just given the recruiter a reason to reject you — and you highlighted it. They might not have even noticed the gap until you pointed it out. Apologizing for what you lack signals insecurity and puts a negative frame on your entire application.

The fix:

Never apologize. Instead, redirect to what you do bring.

"My three years in mid-market sales gave me a crash course in consultative selling — I closed $1.8M last year by building relationships in accounts where we had no existing footprint. That cold-start experience is directly relevant to building Acme's enterprise presence from scratch."

The gap is still there. But you've reframed it as a strength. The focus is on what you've accomplished, not what you haven't.

Mistake 8: Weak Close

What it looks like:

"Thank you so much for considering my application. I look forward to hearing from you and would be happy to discuss this opportunity at your earliest convenience. Please don't hesitate to reach out if you have any questions."

Why it kills your application:

It's passive and forgettable. "Thank you for considering" sounds like you're already expecting rejection. "At your earliest convenience" puts all the power in their hands. This close leaves no impression.

The fix:

Close with confidence and specificity. Express interest, suggest a next step, and stop.

"I'd welcome a conversation about how my experience scaling B2B content programs maps to what you're building. I'm available any day this week."

Short. Direct. Forward-looking. No groveling. The candidate is proposing a conversation, not begging for one.

The Fix for All 8: Better Input, Better Output

Every mistake on this list stems from one of two problems: either the writer didn't have enough specific material to work with, or they didn't know how to structure a persuasive argument in 300 words.

AI tools solve both — when used correctly. A good AI cover letter tool takes the job description (for specificity) and your background (for evidence) and produces a structured, concise letter that avoids these common pitfalls by design.

Postulus is built to avoid every mistake on this list. The AI is specifically instructed to: avoid generic openers, never rehash the resume, stay under 350 words, use a natural professional tone, lead with evidence over claims, reference the specific company, never apologize for gaps, and close with confidence.

Paste the job description, add your background, get a tailored letter in 30 seconds. Preview free, full letter for $2.99.

Try Postulus free →