We built this piece on a composite scenario. There’s no client behind it and no real names, and the numbers inside the emails are scenario detail rather than results we’d claim.
The situation
The sender makes precision machined parts to order. The reader is a purchasing manager at a plant buying 40 part numbers a year. They already have a supplier for this family, and there’s nothing wrong with the work.
That’s the hard version of cold email. There’s no fire to point at and no budget sitting unspent. Switching costs them a qualification cycle they never asked for.
So the sequence never asks her to switch. It asks to be second on a list, which is a far smaller yes than a change of supplier. Every email shrinks the ask and hands them one thing they didn’t have before.
Five emails over 24 days. Every body runs 60 to 120 words, because they read it standing up. Not one of the 5 asks for a demo. Subject options and send logic come with it, the way we ship any email sequence.
Email 1 - the observation
Subject lines
- second source for [their part family]
- [their part family] - first article in 3 weeks
- 2 new programmers, same supply base
Body
Hi [First name],
You posted 2 CNC programmer roles this quarter and added a second shift on [their part family]. Plants tend to do that when volume runs ahead of the supply base standing behind it.
We run 6 machining cells on parts like yours, and first articles go out in 3 weeks instead of 8. I’m not asking you to move anything today.
If [their part family] sits on your desk, send me one drawing and the annual volume behind it. I’ll come back with a lead time and a price you can file next to the one you already have.
[Your name]
Send: Day 0, Tuesday morning. Why this email exists: it trades a meeting for a drawing, and a drawing is a 2-minute decision on their side.
Email 2 - the objection she hasn’t said
Subject lines
- what a second source actually costs you
- the qualification math on [their part family]
- 2 pages, no form
Body
Hi [First name],
Most plants run one supplier per part family, because qualifying a second one looks expensive from the outside. It usually isn’t.
Our sheet on it runs 2 pages: first article, PPAP level 3, a 50-piece trial run, and the hours each step takes on the plant’s side. It ends with the line most plants get wrong, which is the internal engineering time rather than the tooling.
Say the word and I’ll send it. No form and no call.
[Your name]
Send: Day 4. Why this email exists: it answers the objection they’d never raise out loud, and the ask is a 3-word reply.
Email 3 - the cost of doing nothing
Subject lines
- 11 weeks with one supplier
- the part that stops your line
- single-source risk on [their part family]
Body
Hi [First name],
A tooling failure at a single-source supplier opens an 8 to 11 week hole, and your line won’t wait that long. The gap gets bought at spot price, and the premium runs 30% or worse.
I’d rather you had a number on file before that week lands. Send me 2 drawings from [their part family] and we’ll quote them at your real volumes, with a note on what tooling would cost.
Nothing moves on your side. The quote is yours whether we work together or not.
[Your name]
Send: Day 9. Why this email exists: it prices the cost of doing nothing, and never once says their supplier is bad.
Email 4 - the trigger
Subject lines
- for your next price increase letter
- when [their part family] slips past 12 weeks
- park this until you need it
Body
Hi [First name],
Two moments make a second source worth having. A price increase letter, and a lead time that slips past 12 weeks. Both land without warning, and both are bad days to start looking.
Our capability sheet is one page. Tolerances, materials, batch sizes from 25 to 5 000, the 4 alloys we run most, and a short list of what we don’t do.
Put it in the folder with your approved vendors. Reply with 2 words and it’s with you in a minute.
[Your name]
Send: Day 16. Why this email exists: it turns the offer into insurance they can file in 30 seconds, with no decision attached.
Email 5 - the exit
Subject lines
- closing the loop on [their part family]
- last one from me
- wrong person
Body
Hi [First name],
I’ve sent 4 emails and you haven’t needed a single one of them. That’s a fair answer, and I’ll stop here.
A quick note before I do. If someone else owns [their part family], forward this and I’ll take it from there. If the timing is simply wrong, tell me the month your next sourcing review lands and I’ll come back that week.
Either way, thanks for the read.
[Your name]
Send: Day 24. Why this email exists: it closes the loop, and permission to return in 6 months beats one more pitch.
What changes if they reply
A reply to email 2 or 3 stops the sequence. The next message out is the quote or the 2-page sheet they asked for, inside 1 working day, and emails 4 and 5 never send.
That’s the whole send logic. It fits on one page, and it ships with the drafts.