Using Apple Mail on Two Macs: What Syncs and What Doesn't

You spent an afternoon setting up Apple Mail exactly the way you like it: rules that file newsletters automatically, a smart mailbox that surfaces everything waiting on a reply, signatures tuned per account, a VIP list of the senders whose messages always cut through. Then you opened your second Mac and none of it was there. The inbox looked like day one.

The question most people search next is a fair one: why doesn't Apple Mail sync settings between Macs the way iCloud syncs almost everything else? The answer is that some things do sync — messages themselves, and the folder structure on your mail server — while a specific set of app-level configuration is deliberately machine-local. Knowing which is which stops you spending time hunting for a toggle that doesn't exist.

This guide covers the full picture: a row-by-row sync table for every Apple Mail setting people actually configure, the manual steps to replicate the four things that don't sync automatically, how behavior differs across macOS Ventura, Sonoma, and Sequoia, and what to do when something that should sync isn't. The short answer: your mail syncs. Your configuration largely doesn't. But each gap has a fix.

Which Apple Mail settings sync between two Macs, and which don't?#

The confusion comes from iCloud doing two different jobs at once. First, it syncs the messages and folders stored on your mail server — that part is IMAP working as intended, not iCloud specifically. Second, it syncs account credentials for accounts you added through System Settings, so you don't have to re-enter passwords on every device. What iCloud doesn't do is sync Apple Mail's own configuration layer: how you've told the app to behave, organize, and display.

The table below maps every commonly configured item, its sync status, where it's stored, and which macOS versions apply. This is the sync matrix that most people have to piece together from forum threads.

Before you start: confirm iCloud account sync is enabled#

Before manually replicating any configuration, confirm that the basics are in place. If iCloud account sync isn't on, your mail accounts won't appear on the second Mac at all, and the steps below have nothing to build on.

On your main Mac, open System Settings, click your Apple ID, select iCloud, and look for the list of apps using iCloud. Confirm that Mail is toggled on. On macOS Ventura and later, this lives under iCloud > Apps Using iCloud — it moved when Apple renamed System Preferences to System Settings. Open the same screen on your second Mac and confirm the same toggle is active. Once enabled, your IMAP accounts and their server-side folders should appear within a few minutes of signing in.

Before anything else: confirm both Macs use IMAP, not POP3. IMAP leaves messages on the server and syncs them across devices. POP3 downloads and removes them, so your messages end up split across local archives rather than living on the server where both Macs can reach them. Check in Mail > Settings > Accounts — a POP3 account shows "Account Type: POP" under its settings.

How to set up Apple Mail the same on a second Mac#

Once accounts are confirmed and messages are flowing, these steps replicate the four settings that don't sync automatically. Do them in order — accounts first, then configuration — or imported files may point to accounts the app doesn't recognize yet.

1. 1

   1. Copy signatures via iCloud Drive

   On your main Mac, open Finder and press Shift-Command-G, then enter ~/Library/Mail. Open the highest-numbered V* folder (usually V9 or V10 on recent macOS), then open MailData > Signatures. Copy the entire Signatures folder to iCloud Drive. On the second Mac, navigate to the same path (~/Library/Mail/V9/MailData/ or whichever V* folder exists there) and replace the Signatures folder with the one you just copied from iCloud Drive. Restart Mail on the second Mac. Your signatures should now appear under Mail > Settings > Signatures.

2. 2

   2. Export and import mail rules

   On your main Mac, open Mail and go to Mail > Settings > Rules. Select all rules, then click Export and save the resulting file to iCloud Drive or another location accessible from the second Mac. On the second Mac, open Mail > Settings > Rules and look for an Import option — on some macOS versions this is File > Import Rules; on others you drag the exported file into the Rules pane. Your rules appear immediately. Rules that reference On My Mac mailboxes on the first Mac will import successfully but won't fire correctly until matching local mailboxes exist on the second Mac.

3. 3

   3. Copy the smart mailboxes file

   Smart mailboxes live in a single file: SmartMailboxes.plist inside ~/Library/Mail/V9/MailData/. Quit Mail on both machines before touching this file — copying it while Mail is open can corrupt the library. Copy SmartMailboxes.plist to iCloud Drive, then place it at the same path on the second Mac, replacing the file that's already there. Restart Mail. Your smart mailboxes appear in the sidebar under Smart Mailboxes. Results look empty at first while Mail indexes message data on the new machine; they fill in within a few minutes.

4. 4

   4. Recreate the VIP list by hand

   Apple Mail's VIP list doesn't export cleanly. The fastest approach: look at your main Mac's VIP section in the sidebar to see which names are listed, then on the second Mac right-click any message from each VIP sender and choose Add to VIPs. Most users have ten VIPs or fewer, so doing this by hand takes under two minutes and avoids manipulating the underlying plist, which is fragile and account-scoped.

5. 5

   5. Match general preferences manually

   Layout preferences — reading pane position, message preview lines, threading view, swipe actions, notification sounds — are machine-local and have no clean export path. Go through Mail > Settings on the second Mac and match the settings you care about. Junk filter training is also local and will retrain itself over a few weeks as you mark junk on the new machine; nothing to do there except let it run.

Does Apple Mail sync behavior differ across macOS Ventura, Sonoma, and Sequoia?#

The sync picture has been stable across macOS 13 (Ventura), 14 (Sonoma), and 15 (Sequoia). Apple has not shipped automatic syncing for rules, signatures, or smart mailboxes in any of these releases. What has changed is where certain settings live in System Settings and how reliable account sync is in practice.

The table below notes the differences that matter when you're running Apple Mail across two Macs that may be on different macOS versions.

What to do when Apple Mail isn't syncing as expected#

If messages aren't appearing on the second Mac at all, the cause is almost always one of three things: iCloud account sync is off, the account is configured as POP3, or Mail hasn't finished its initial sync after a fresh login. Each has a different fix, and they're worth ruling out in that order before you try anything else.

No accounts visible on the second Mac usually means iCloud account sync is off or the Apple ID isn't signed in. Open System Settings > [your name] > iCloud > Apps Using iCloud, toggle Mail off, wait ten seconds, and toggle it back on. This forces iCloud to re-push the account credentials. If the account appears but messages are loading slowly, give Mail fifteen to twenty minutes — it downloads recent headers first, then message bodies, so the inbox looks sparse for a few minutes after a fresh login.

Smart mailboxes showing zero results after you've copied the plist is almost always a timing issue. Smart mailboxes run a query against live message data, and results don't populate until Mail has indexed enough headers to match the criteria. Wait five minutes and check again. If results are still empty, open Mail > Settings > Smart Mailboxes and open each one to confirm the criteria imported correctly — the criteria should be intact even if the results haven't caught up yet.

Rules not firing on the second Mac after import are usually disabled rather than missing. After importing, go to Mail > Settings > Rules and confirm each rule has its active checkbox ticked. Rules import in whatever state they were in when exported — if some were disabled on the first Mac, they arrive disabled on the second.

A faster way: email that follows you across Macs without the copy routine#

The reason Apple Mail settings don't sync is that Mail was designed as a local app first — configuration lives on the device, not in the cloud. That works well for a single-Mac setup and becomes a recurring cost when you work across two machines. Replicating rules, signatures, and smart mailboxes every time you add or replace a Mac is a solvable problem if you use a client that stores configuration in your account rather than on the device.

We build AI Emaily, an email client for Mac, Windows, iOS, and web that connects Gmail, Outlook, iCloud, and IMAP accounts in one inbox. Because AI Emaily's triage rules, context settings, and personal context brain live in your account, you log in on a second Mac and your setup is already there — nothing to export, import, or copy. The 7-day free trial (no charge if you cancel before day 7) is a reasonable way to find out whether that cross-device consistency is worth a switch for your workflow. Details at aiemaily.com/pricing.