Introduction

You send a proposal, the client goes quiet, and two days later you hear, “It was in spam.” Sound familiar? Email providers tightened the screws this year, and contractors are feeling it. Here’s what’s changed, why proposal emails get filtered, and practical fixes you can apply today. We’ll cover attachment limits, link rules, timing, and an acceptance flow that makes saying yes easy. The goal is simple: your proposals get opened, understood, and signed—without extra admin.

Table of Contents

• Key Takeaways
• What Changed In 2025 Email Filters
• Attachments, Links And The Triggers To Avoid
• Subject Lines And Timing That Actually Work
• Make Acceptance Frictionless
• Speed From Site To Proposal With Voice Capture
• Frequently Asked Questions
• Conclusion

Key Takeaways

• Email filters in 2025 aggressively scan big PDFs, mismatched links, and image-heavy messages. Keep proposal attachments under 5 MB where possible.
• Many mail servers cap total attachment size around 20–25 MB; oversized proposals are throttled or blocked.
• In general, proposals sent within 2–4 hours of a site visit get read and acted on more than those sent days later.
• It’s common for homeowners to make a decision within 24–72 hours when they can e‑sign immediately.
• Contractors often report saving 2–3 hours per week by using voice capture to draft proposals before leaving the driveway.

What Changed In 2025 Email Filters

Email deliverability got tougher. Providers now do deeper link scanning, attachment inspection and domain checks. Generic senders, heavy PDFs and link shorteners are common red flags.

The Problem

• Stricter DMARC enforcement and domain alignment checks are now the norm.
• Link scanners penalise messages where the sender domain and the proposal link domain don’t align.
• Big, image-heavy emails look promotional, not transactional, and get deprioritised.

The Solution

• Use your own domain for sending and align it with your proposal links. Avoid free mailbox domains for business proposals.
• Keep the email lean: one clear CTA, one link to the proposal, and a small PDF copy for convenience.
• Maintain consistent sender name and address so clients and filters build trust over time.

Real-World Example

A small refurb firm switched from a free mailbox to a domain-matched sender and proposal portal link. They trimmed their PDF from 12 MB to 1.8 MB and removed a link shortener. Result: clients started replying same day again. In general, contractors see fewer “did you get it?” calls once domain and link alignment are set.

Attachments, Links And The Triggers To Avoid

Attachments and links are where most proposal emails get into trouble.

The Problem

• Oversized attachments. Many servers cap attachments at 20–25 MB; some clients only accept less than 10 MB.
• URL shorteners and tracking-heavy links are frequently flagged.
• Mismatched domains: sender from one domain, proposal hosted on a totally different one.
• Large image banners push the email into “marketing” territory.

The Solution

• Aim for PDFs under 5 MB. Export at sensible resolution, compress images, and avoid embedding huge photos in the email body.
• Link directly to your proposal in a secure client portal hosted on a trusted domain. Avoid shorteners.
• Keep the email layout simple: text + one primary action. Let the PDF carry the visuals.

Example And Quick Wins

A bathroom specialist replaced an 18 MB PDF (lots of site photos embedded) with a 1.6 MB export and put the full photo set inside the portal. Delivery issues disappeared and clients could open everything on their phone.

Subject Lines And Timing That Actually Work

Good proposals still fail if the subject line is vague or you send at the wrong moment.

The Problem

• Generic subjects like “Quote” or “Estimate” get lost.
• Late-night sends land under morning noise and get buried.
• No clear next step, so clients “park it for later”.

The Solution

• Use clear, specific subjects: “Proposal – 14 Oak Road – Bathrooms – Review & E‑Sign”. Property address anchors attention instantly.
• Send while the visit is fresh. In general, proposals sent within 2–4 hours of the survey are opened and discussed faster.
• State the decision path in the first line: what’s included, validity, and how to accept.

Example Subject And Send Plan

• Subject: “Proposal – 14 Oak Road – Bathroom Upgrade – Review & E‑Sign”
• Body first line: “Includes scope, materials, and programme. Valid 14 days. Use ‘Approve & Sign’ to lock dates.”
• Send window: same afternoon as the visit, before 6pm. Follow up next morning if unopened; call on day 3 if no activity. Commonly, this rhythm avoids chasing for weeks.

Make Acceptance Frictionless

If acceptance requires printing, scanning, or back-and-forth emails, momentum dies.

The Problem

• Clients want to say yes on their phone. Anything slower adds doubt.
• Handwritten signatures and manual countersigning add days.
• Approval emails without a clear acceptance action cause misunderstandings.

The Solution

• Use digital acceptance with a legally binding e‑signature.
• Present one clear “Approve & Sign” action and confirm what happens next (deposit request, scheduling, information needed).
• Convert acceptance straight into an invoice so the admin doesn’t stall mobilisation.

Example With Donizo

On Donizo, you send a branded PDF with client portal access, clients e‑sign digitally, and you can convert the accepted proposal to an invoice in one click. Commonly, when clients can sign on the spot, decisions land within 24–72 hours and the email back-and-forth drops by half. On the free plan you can export PDFs (with watermark); paid plans remove watermarks and add custom branding for a more polished look.

Speed From Site To Proposal With Voice Capture

The fastest path to a solid proposal is capturing details while you still remember them.

The Problem

• Field notes scattered across photos, texts and notebooks.
• Evenings lost typing up scopes.
• Details missed because you waited until the weekend.

The Solution

• Dictate the scope, quantities and photos on site. Voice capture locks in specifics while you’re looking at the job.
• Turn those notes into a proposal and send before you drive off.

Example With Donizo’s Voice-To-Proposal

Many contractors find they can narrate scope, add photos, and generate a professional proposal in minutes. It’s common to save 2–3 hours per week by skipping manual write-ups. From there, send the proposal with client portal access, collect a legally binding e‑signature, and, once approved, convert to an invoice—no retyping.

Frequently Asked Questions

Why Do My Proposal Emails Land In Spam?

Filters look for mismatched domains, heavy attachments, link shorteners, and marketing-style layouts. Align your sending domain with your proposal link, keep PDFs under 5 MB, avoid shorteners, and use a simple text-first email.

Should I Attach A PDF Or Use A Portal Link?

Do both: attach a light PDF for quick reference and include a single portal link for full detail and e‑signature. Many servers allow attachments up to 20–25 MB, but staying under 5 MB improves openability on mobiles and reduces scanning delays.

What Subject Line Works Best For Homeowners?

Be specific: “Proposal – [Address] – [Project] – Review & E‑Sign”. Addresses stand out in crowded inboxes and instantly tell the client it’s their job. Avoid generic words like “Quote” alone.

How Soon Should I Follow Up If I Hear Nothing?

If unopened after 24 hours, resend or call to confirm receipt. If opened but no action, a short nudge at 48 hours helps. Commonly, decision windows are 24–72 hours when the client can sign digitally.

Are E‑Signatures Legally Binding For Residential Work?

Yes, e‑signatures are widely recognised as legally binding when the system records identity, intent and a clear audit trail. Donizo’s e‑signature workflow captures these elements so you can proceed with confidence.

Conclusion

Proposal delivery changed this year. Keep files lean, align domains, avoid link shorteners, and spell out the next step. Then make acceptance fast with a clear e‑signature path and immediate invoice creation. If you want to cut the admin loop= further, use Donizo to capture scope by voice, send a professional proposal with client portal access, collect a legally binding e‑signature, and convert to invoice in one click. Less chasing. More signed work.