Quick question on last week’s invoice #1234
Type: Finance / Billing
Tone: Direct, courteous
This subject line links the email to a specific document, such as invoice #1234, so the accounts payable department can quickly process it.
Use it when you spot a mismatch, such as a missing PO number, and require a quick response to maintain smooth cash flow.
Here’s your single-use link to [Access documents/other details]
Tone
Reassuring, concise, technical
Why I Chose This
Finance apps and privacy-first tools win trust when they highlight security early. “Single-use link” signals safety, while “kept it simple” soothes non-tech users.
When to Use
Best for password-less login flows, encrypted messenger invites, or any service where a magic link completes onboarding. Send instantly; delay can leave users locked out.
Tips
- Explain expiry in the email footer to avoid confusion if the link lapses.
- Offer backup (e.g., SMS code) for users who miss the window.
Payment due today for invoice #[invoice number]
Type
Financial, Billing, B2B
Tone
Clear and concise
Why this line works
Numbers leap off cluttered inboxes, and adding the invoice ID provides instant context. Avoid jargon, keep verbs quick, “due today”, and reference the invoice only once to limit cognitive load.
Hidden pitfalls to avoid
- Skip vague wording like “outstanding balance.” Specificity feels transparent.
- Include the payment link inside the email so recipients need one click, not three.
Example email
Hello [First Name],
I’m sending this gentle reminder that invoice #[invoice number] reaches its due date today.
If you already handled it, please disregard. Otherwise, you can settle securely through the button below.
Thanks for keeping our books tidy.
Best,
Sam
