Email templates: the automation with the highest ROI

Of everything you could automate, canned replies have the best ratio of effort to payoff. Setup is minutes, the skill required is none, and if you send the same message more than twice a week you will feel the difference immediately.
Find your templates before you write any
Do not invent them. Open your sent folder and read the last two weeks. The messages you are writing repeatedly will be obvious, and they are almost always the same handful: scheduling, acknowledgement, a standard set of onboarding questions, a polite no, a request for information you always need, and a follow-up nudge.
- The acknowledgement. Received, here is when I will come back to you. Buys time and prevents the chasing email.
- The intake questions. The five things you always have to ask before you can start. Saves an entire round trip every time.
- The polite decline. Hardest to write under pressure and therefore the highest-value one to have ready. Writing it once, calmly, is far better than improvising it while irritated.
- The follow-up. Two lines, no reproach. Most unanswered emails are forgotten rather than refused.
- The handoff. Introducing two people with the context they each need. Structurally identical every time.
Writing them so they do not read as templates
The tell is always the same: a message that answers a generic version of the question rather than the one that was asked. Three habits prevent it.
Leave deliberate gaps. Mark the spots that must be filled in with something impossible to miss, so an unedited send is obvious before it happens rather than after.
Keep the first line out of the template. Write one specific opening sentence every time, referencing something from their message. That sentence does almost all the work of making a templated reply feel personal.
Make them shorter than you would write naturally. Templates get padded because you are writing for every possible recipient. Cut them back to the minimum and add specifics per message instead.
Where to keep them
Two options, and the second is better. Mail-client templates or canned responses work fine but only inside that client. A system-wide text expander — a short trigger string that expands into the full text anywhere you type — works in email, chat, ticketing systems, forms and documents. Both major desktop platforms include text replacement natively, which covers the basics without installing anything.
Name your triggers so you can recall them without a list: a consistent prefix plus a short word beats a set of clever abbreviations you will forget. Review the set once a quarter and delete anything you have not used, because an expander full of stale templates is slower to search than typing.
The follow-up sequence
One template worth having as a set rather than a single message: the three-stage follow-up. First nudge at four days, brief and assuming they simply missed it. Second at ten days, adding one new piece of information so the message has a reason to exist. Third at three weeks, explicitly closing the loop — telling them you are assuming it is not a priority and leaving the door open. Having all three written in advance is what stops follow-up from being an emotional decision you keep deferring.