When the Out-of-Office Reply Doesn't Stop the Work

The automatic reply is set on Friday afternoon. It is courteous and clear: away until the 22nd, limited access to email, for urgent matters please contact a colleague. Then the laptop closes and the leave begins.

The emails do not stop. They keep arriving, addressed to the person by name. Customers who have always dealt with them. Suppliers with a query on last month's order. A colleague who needs a file only they can find. Each sender receives the polite reply. Most of them, reasonably, decide their question can wait. So it waits, in one inbox, for one person, for two weeks.

This piece looks at what happens when the out-of-office reply informs people of an absence but does nothing to move the work. It is built on a hypothesis rather than a measured study: that in many businesses, work is routed to individuals rather than to roles, so leave pauses the work instead of passing it on.

What the automatic reply actually does

Microsoft's support page for automatic replies in Outlook describes the feature accurately. It sends a customised message once to each person who emails during the absence. It can be scheduled with a start and end time, and separate messages can be set for people inside and outside the organisation.

That is all it does, and it is useful. But it is worth noticing what it does not do. It does not assign the email to anyone. It does not tell a colleague that a customer is waiting. It does not record which requests arrived and which were dealt with. The message leaves; the work stays.

Most of the time, the reply hands the decision back to the sender. They must choose whether to wait, to write to the named colleague, or to try someone else. Many choose to wait, and the backlog grows in the absent person's inbox.

Leave is a right, not a gap in the schedule

In South Africa, the Department of Employment and Labour's basic guide to annual leave sets out that workers are entitled to a minimum of 21 consecutive days of annual leave each year, or by agreement one day for every 17 days worked. It also states that employers may not pay workers instead of granting leave, except when employment ends.

The intent is that people actually take time away. A system of work that piles up behind an absent employee does not prevent them from taking leave, but it changes what leave is like. For some people, the knowledge that work is accumulating with their name on it may make the time away feel less complete. Mellorca cannot say how any individual experiences it, and some people are entirely comfortable letting things wait. The narrower point is that the way work is routed shapes what the person returns to.

An illustrative absence

Consider an illustrative case: the account manager at a South African printing and signage company with about twenty-five staff. They look after around forty regular customers, most of whom email them directly.

Before leave, they set an out-of-office reply naming a colleague.
During the two weeks, around a third of customers write to the colleague. The rest wait, or call the office and ask for the account manager by name.
The colleague, who does not have access to the account manager's inbox, cannot see what has arrived or what is outstanding.
On return, the account manager faces several hundred emails and spends the first two or three days triaging, apologising and catching up. Some requests that arrived on day one are answered on day fifteen.

Nobody in this scenario did anything wrong. The account manager followed good practice. The colleague helped where asked. The work simply had nowhere to go except one person's inbox. Mellorca's piece on when business knowledge lives in inbox history describes the wider pattern.

The human tax: presence and time

The first tax falls during the leave itself. The person may be physically away but partly present in the backlog, wondering what has arrived, glancing at email to make sure nothing serious has been missed. Mellorca has written about the owner's version of this in why holidays still need a laptop in the suitcase. This piece concerns employees, whose work is often routed to them personally by habit rather than by necessity.

The second tax falls on return. The days after leave become a period of catching up, during which new work also arrives. Some of the rest gained can be spent quickly.

A third, smaller tax falls on colleagues. They are named in the automatic reply but given neither access nor context, so they cover blind.

What could realistically change

The goal is to route work to roles and shared places, so that one person's absence does not stop it.

Use shared mailboxes for shared work. Microsoft's documentation describes shared mailboxes for addresses that several people need to monitor, such as company information, support or reception addresses, with members able to send as the shared address. Customer and supplier correspondence that belongs to a function, rather than a person, can live there.
Introduce role addresses gradually. Customers can be asked, over time, to write to an accounts or orders address. Personal relationships remain; the work becomes visible to more than one person.
Give cover real access. Where personal mailboxes must remain, delegated access during leave lets a colleague see what has arrived instead of waiting to be forwarded.
Write a short handover. A one-page list of open items, expected requests and who will handle them helps the colleague act rather than guess. Mellorca's guide on how to design a handoff that cannot depend on memory is relevant here.
Agree what absence means. The World Health Organization and International Labour Organization, in their guidance on healthy teleworking, recommend agreeing a common system for signalling availability and ensuring that managers and colleagues respect it. The same principle applies to leave.

Shared mailboxes bring their own difficulties, explored in why shared inboxes become operational bottlenecks. They need clear ownership of each message, or they simply spread the backlog across more people.

What changes first, and the business outcome

The first change is that requests arriving during leave are seen and handled by someone else, rather than parked. The automatic reply becomes a courtesy instead of the only thing that happens.

For the business, customers wait less, responses are more consistent and fewer requests are lost. The return from leave becomes a short catch-up rather than a recovery project.

The human dividend

The dividends are presence and time. Presence, because time away can be more fully away when the person knows the work has somewhere else to go. Time, because the days after return are not consumed by a backlog that built up only because it had nowhere else to sit.

What the person does with their leave is their own business. The dividend is that it can be leave on their terms, not a pause before a pile.

The trade-offs

Relationships can feel diluted. Some customers value dealing with one person, and some employees value being that person. Role addresses should support relationships, not replace them.
Shared inboxes need discipline. Without clear ownership, messages can be seen by everyone and handled by nobody.
Delegated access raises privacy questions. Personal mailboxes may contain private correspondence. Access should be agreed, limited and transparent.
Cover still takes effort. The colleague handling the work during leave carries more for that period, and that should be recognised.

Why it matters

An out-of-office reply is a promise of absence that the surrounding system often does not keep. The person leaves; their work waits for them, by name.

Mellorca's interpretation is that this is a routing problem, not a commitment problem. When work belongs to roles and shared places, leave can be what it is meant to be. What changes for the human being is that going away no longer means coming back to everything that could not happen without them.

Sources and further reading

How to set up out of office automatic replies in Outlook - Microsoft Support (last verified 10 October 2026)
About shared mailboxes in Microsoft 365 - Microsoft 365 admin (last verified 10 October 2026)
Basic Guide to Annual Leave (last verified 10 October 2026)
Crucial changes needed to protect workers’ health while teleworking (last verified 10 October 2026)