The mechanism is worth understanding because it explains why this feels harder than it is. An unanswered message occupies a small amount of attention every time you see it, and that cost compounds across a full inbox. The reply itself takes ninety seconds. The avoidance costs considerably more in total, distributed invisibly across a fortnight.

The messages people avoid fall into recognisable categories, and each has a short answer. Something you cannot help with, which needs a no and ideally a referral. Something requiring a decision you have been putting off, where the message is not the problem. Something asking for a favour you would rather not do. And something from a person you find difficult, where the difficulty is the reason rather than the content.

For anything you cannot help with, say so in two sentences and offer a direction if you have one. Detailed explanations of why you cannot help invite negotiation, and a lengthy apology for a straightforward no makes the exchange longer than it needed to be for both parties.

For anything requiring a decision, make the decision or say when you will. A holding reply stating that you need until Friday is a complete answer, and it removes the message from your inbox and from your attention in a way that leaving it does not.

For a favour you do not want to do, decline without inventing a reason. Reasons are conditions the other party can remove, and a manufactured one produces a follow up offering to work around it. I am not able to take that on is sufficient and it is honest.

Batch them rather than handling each as it arrives, since the psychological cost is in the switching. Twenty minutes once a day clearing anything that has been sitting is considerably easier than confronting them individually across a week, and it converts an ongoing discomfort into a scheduled task.

Set a rule about what you simply will not answer, because some messages do not warrant a reply and treating everything as an obligation is what makes the inbox overwhelming. Unsolicited sales approaches, automated messages, and anything from somebody attempting to sell you services do not require a response, and deciding that once removes a recurring judgement.

Then notice which types recur, since a pattern indicates something upstream. Repeated enquiries you cannot help with means your description is attracting the wrong people. Repeated requests for the same thing means it should be answered publicly. The inbox is frequently reporting a problem that belongs somewhere else.

Write the difficult ones first rather than last, since the reply you compose while fresh is shorter and clearer than the one produced at the end of a day. The avoidance tends to push these into exactly the hours when they are hardest to write.

Accept that some will be received badly regardless of how you phrase them, which is the fear underneath most of this. A clear no occasionally produces a disappointed response, and that is a considerably smaller cost than a fortnight of avoidance followed by the same conversation.

Set a limit on how long anything sits unanswered, such as forty eight hours, and treat reaching it as the decision itself. Most of what accumulates does so because no moment was ever the moment, and a deadline supplies one.

Delete rather than filing anything that needs no reply, since an archive of messages you decided not to answer serves no purpose and the act of filing is itself a small tax on attention.