They view, accept, sign and pay. No “did you get my quote?”
You sent the quote on Tuesday. It's now Friday. You're tempted to ring but you don't want to look needy. The customer was actually going to sign on Wednesday but they couldn't find the email and gave up. You both lose.
Send a portal link instead of a PDF. The customer opens, reads, asks questions, accepts the quote, e-signs, pays the deposit — all in one place. You see exactly when they viewed, accepted and paid on your dashboard, so the “did you get my email” follow-up never has to happen.
It's free. No card. Open it and have a go.