How Do I Set Up an Automatic Reply in Outlook? Check the Mailbox You’re In

To set up an automatic reply in Outlook, open View > View settings > Accounts > Automatic Replies in new Outlook, or File > Automatic Replies in classic Outlook; turn automatic replies on, schedule the start and end, write the internal message, choose whether external replies go to contacts or everyone, write the external message, and select Save or OK. Microsoft Learn says Microsoft 365 and Exchange automatic replies run from the mailbox, so the Outlook app can be closed after the setting is saved.

The mailbox matters more than the screen. Outlook can show a personal Microsoft 365 account, a Gmail account and a shared address in one window, while each has different controls. Before writing a word, confirm the account shown at the top of the settings pane. A perfectly timed reply attached to the wrong mailbox is finished scenery on the wrong stage.

Where is Automatic Replies in each version of Outlook?

Microsoft Support publishes four current routes to the same mailbox setting. The names differ because “Outlook” now covers the new Windows application, classic Outlook, the browser service and the mobile apps.

| Outlook version | Route to the setting | Save control | | --- | --- | --- | | New Outlook for Windows | View > View settings > Accounts > Automatic Replies | Save | | Classic Outlook for Windows | File > Automatic Replies > Send automatic replies | OK | | Outlook on the web or Outlook.com | Settings > Account > Automatic replies | Save | | Outlook for iPhone or Android | Settings > account > Automatic Replies | Save |

In new Outlook and on the web, Microsoft Support instructs users to enable Send replies only during a time period before entering the two times. Classic Outlook calls the same control a date range. Without an end time, the support page says the reply stays on until someone turns it off manually.

Outlook mobile exposes more than a small on/off switch. Microsoft’s iOS and Android instructions allow a timed reply, separate messages for the organization and external senders, a Block my calendar event, and selected meeting cancellations through Clear my calendar. Those calendar choices remain separate jobs even though they occupy the same pane.

What does Outlook save when an automatic reply is scheduled?

Microsoft Graph’s `automaticRepliesSetting` specification shows the pieces behind the visible controls: mailbox state, scheduled start, scheduled end, internal message, external message and external audience. That is the useful pre-save inspection list. The interface may move; those six parts still determine what the mailbox does.

The schedule requires two complete date-and-time values. Microsoft’s Exchange PowerShell reference gives a checkable example: `StartTime` is 8:00 a.m. on July 10, 2018, and `EndTime` is 5:00 p.m. on July 15, 2018, with `AutoReplyState` set to `Scheduled`. Those are documentation specimen values, not recommended vacation dates. Microsoft Graph types both schedule fields as `dateTimeTimeZone`, so a real setup should be checked against the displayed time zone as well as the clock.

The start should be the moment the sender can no longer expect a normal response; the end should be the moment normal handling resumes. For a leave beginning after work on Friday and ending Monday morning, that means using the actual Friday departure time and Monday return time, rather than all-day dates that silently add two midnights. Microsoft’s update-mailbox-settings example rejects a start later than the end with the message “Start Time should occur before End Time.”

The mailbox state has two vocabularies. Microsoft Graph uses `disabled`, `alwaysEnabled` and `scheduled`; the Exchange PowerShell cmdlet uses `Disabled`, `Enabled` and `Scheduled`. The difference is a product-interface label, not a fourth behavior.

| Intended behavior | Microsoft Graph state | Exchange PowerShell state | | --- | --- | --- | | No automatic reply | `disabled` | `Disabled` | | Reply until manually switched off | `alwaysEnabled` | `Enabled` | | Reply between start and end | `scheduled` | `Scheduled` |

External audience also has an exact policy. Graph permits `none`, `contactsOnly` or `all`; Exchange PowerShell names the equivalent choices `None`, `Known` and `All`. Microsoft Support recommends contacts only because “everyone” can include newsletters, advertisements and junk mail. A supplier absent from Contacts will receive nothing under the narrower policy, so the choice needs checking against the people who genuinely require an answer.

What should an Outlook automatic reply say, and how long can it be?

A useful message gives the absence window, the next response point and a genuine alternate route for work that cannot wait. Internal and external text deserve separate treatment. Microsoft’s settings provide two fields precisely because a colleague may need a team mailbox or extension that should not be sent to every address on the internet.

This 47-word external example fits the job without publishing a personal itinerary:

> Automatic replies are active until 8:30 a.m. Monday, September 21. Messages will be reviewed after that time. Queries affecting tonight’s performance should go to the duty stage manager through the company switchboard. Routine requests will remain in this mailbox for review after the return time.

Outlook’s current support instructions and Microsoft Graph resource specification publish no overall character limit for the automatic-reply body. Graph defines `internalReplyMessage` and `externalReplyMessage` as strings but gives neither field a `maxLength`. Claims of a 255-character, 1,000-character or 32 KB Outlook limit therefore need a different product specification before they can be treated as Outlook facts.

There is a transport limit, and it is narrower than a body limit. Standards-track editor Pete Resnick of Qualcomm Incorporated wrote in RFC 5322: “Each line of characters MUST be no more than 998 characters, and SHOULD be no more than 78 characters,” excluding the line break. That governs each email line, not the total automatic reply. For the human reader, a 60-word editorial ceiling is a practical house rule, clearly separate from any Microsoft restriction.

Do automatic replies, Away status and a calendar absence do the same job?

Only automatic replies answer incoming email. Microsoft’s presence documentation says Away is an availability signal based on activity, device state or a manual status. Microsoft’s calendar guidance says an event marked Out of office changes the free/busy view seen by meeting schedulers. Neither action composes or sends an email response.

| Control | What it changes | Answers incoming mail? | What another person sees | | --- | --- | ---: | --- | | Automatic Replies | The mailbox’s server-side OOF rule | Yes, once per sender while active | The written internal or external reply | | Away status | Microsoft 365 presence | No | An Away indicator beside the account | | Calendar absence set to Show As > Out of office | Calendar free/busy availability | No | The time blocked as unavailable when scheduling |

The systems do exchange signals. Microsoft’s Teams presence reference says Out of Office presence appears when automatic replies are active or when the Outlook calendar contains an event shown as Out of Office. It also says Away can appear after a computer is inactive or locked, and on mobile when Teams is in the background. Treat the Away dot as activity data; inspect Automatic Replies to establish the mailbox state.

Microsoft Support’s calendar instructions give the clean division of labor: create an Out of Office event to block the owner’s time, and use Automatic Replies for senders. On iPhone and Android, Block my calendar can create that event from the reply screen, but it remains a calendar item. Check both the mailbox reply and the calendar block when both outcomes are required.

Why is the Automatic Replies option missing, or why does no reply arrive?

Microsoft Support says the built-in Automatic Replies feature is unavailable for Gmail, Yahoo and other POP or IMAP accounts added to Outlook. In classic Outlook, the visible test is simple: open File. If Automatic Replies is absent, Microsoft’s fallback is an Outlook Template (`.oft`) attached to a rule that handles messages received.

That fallback changes the operating condition. Microsoft’s rule instructions require classic Outlook to remain running while the user is away, whereas Microsoft Learn describes Exchange OOF rules as server-side rules that trigger whether the client is running or closed. A laptop lid can therefore stop the template rule while a Microsoft 365 mailbox reply continues.

A missing second test reply can be normal. Microsoft Learn says built-in OOF sends one reply to each sender, even when that sender delivers several messages. Exchange stores those recipients in OOF history and clears the history when the OOF state changes or the rule is modified. The same troubleshooting reference gives that history a limit of 10,000 entries. Test from a second sender before treating silence as failure.

For broader failures, Microsoft Learn names two checks for an administrator: mail marked as spam and delivered to Junk generates no OOF reply, and a remote domain with `AutoReplyEnabled` set to `false` blocks replies to that domain. The remote-domain policy takes precedence over the mailbox’s own external-audience choice.

How are automatic replies set for a shared mailbox?

A personal setting does not cover a shared address. Microsoft Graph defines automatic replies on a particular mailbox, while Microsoft Support says only a Microsoft 365 administrator can set up automatic replies for a shared mailbox. Microsoft uses `[email protected]` as its specimen shared-mailbox address; in a live tenant, the administrator should verify the exact address under Teams & groups > Shared mailboxes > Email addresses.

Microsoft’s admin procedure is Teams & groups > Shared mailboxes > select the mailbox > Automatic replies > Edit. The administrator chooses replies for people inside the organization, enters the inside and outside text, and saves. Microsoft Learn specifies text only: images cannot be added in this shared-mailbox panel.

The address check is easy to skip when the shared mailbox already appears beneath a personal account in Outlook. Microsoft Support says the shared account itself should remain disabled for direct sign-in. Administration happens through delegated membership and the Microsoft 365 admin center, so turning on a reply under the delegate’s personal address changes the wrong mailbox.

How can the automatic reply be tested before the absence begins?

Microsoft Learn’s once-per-sender rule makes a two-mailbox test more informative than repeatedly sending from one address. Use an internal work account for the internal copy and an outside account for the external copy. If the policy is `contactsOnly`, Microsoft Graph’s definition requires that outside test address to exist in Contacts.

1. Set a short temporary schedule that includes the current time, then save it on the intended mailbox.
2. Send one message from the internal account and one from the controlled external account.
3. Check that each sender receives the correct version, dates and alternate route. A reply reaching the wrong inbox exposes a mailbox selection error; the wrong wording exposes an audience selection error.
4. Send a second message from the same test account. Microsoft Learn says no second built-in OOF reply is expected for that sender while its entry remains in OOF history. Restore the real schedule after the check.

If the internal reply arrives and the external one does not, Microsoft’s troubleshooting order points away from the message text. The administrator should inspect the mailbox’s external audience, the external address’s Contact status, Junk handling and the remote domain’s `AutoReplyEnabled` value. Microsoft Learn says a `false` remote-domain value overrides the mailbox setting.

Frequently asked questions

Why doesn’t Outlook have an automatic reply option?

Microsoft Support says Gmail, Yahoo and other POP or IMAP accounts added to Outlook do not support its built-in Automatic Replies control. In classic Outlook, use an `.oft` message template with a rule instead, and leave Outlook running. For Microsoft 365 or Exchange, check File > Automatic Replies or the account settings pane.

How do I write an automatic reply when I’m on vacation?

State the exact return date and response point, then give one monitored route for urgent work. Keep internal contact details out of the external version. Microsoft provides separate internal and external fields. Its documentation sets no overall body-character limit; a 60-word editorial ceiling keeps the dates and alternate contact easy to find.

How do I send an automatic leave reply in Outlook?

Open Outlook’s Automatic Replies setting, turn it on, enable replies during a time period, and enter both start and end times. Write the message, select the external audience, then save. Microsoft Support recommends external replies to contacts only rather than everyone, which can include newsletters, advertisements and junk mail.

How do I make an out-of-office reply in Outlook 2026?

Microsoft does not list an “Outlook 2026” edition in its current support page; it lists Microsoft 365, Outlook 2024 and earlier editions, plus new Outlook. In new Outlook, use View > View settings > Accounts > Automatic Replies. In classic Outlook, use File > Automatic Replies, then schedule, write and save the reply.

How do I set up an automatic reply in Outlook on iPhone?

Microsoft’s Outlook for iOS instructions say to tap Settings, select the email account, tap Automatic Replies, and switch it on. Enable a reply period to set start and end times, choose everyone or only the organization, write separate messages if needed, and tap Save. Block my calendar is optional.

Why do automatic replies not send from my shared mailbox?

Microsoft Support says only a Microsoft 365 administrator can configure shared-mailbox automatic replies. The admin must select the exact shared address under Teams & groups > Shared mailboxes, edit Automatic replies, enter the internal and external text, and save. Personal automatic-reply settings apply to the personal mailbox, not the shared address.