How to set up your business email on every device you use

Getting mail on your phone is easy. Getting the same mail, with the same folders and the same read/unread status, on your phone and your laptop and the desktop at the shop is where people end up with three inboxes that disagree with each other, and a customer email that only exists on a tablet in a drawer.

Here's how to do it once and have it hold.

Choose IMAP. POP will lose your mail.

Every mail setup screen asks you to pick an account type. Pick IMAP.

IMAP keeps your mail on the server and shows you a live view of it. Read a message on your phone, it shows as read on your laptop. Move something to a folder, it moves everywhere. Delete it, it's gone everywhere.

POP does the opposite. It downloads mail onto that one device and, with the default settings, often deletes it from the server afterward. That's how an invoice ends up stranded on an old computer. If any device in your setup is running POP, that device is quietly holding mail hostage from the rest.

Some providers also support Exchange or ActiveSync, which does everything IMAP does plus syncs calendar and contacts. If your email service offers it and your device supports it, take it. Otherwise, IMAP is fine.

Set up the first device properly, then copy the settings

Do your main computer first, because that's where you'll be most patient with a settings screen.

Before you start, grab four things from your email provider's help pages or admin area:

• Incoming server address and port (usually IMAP on port 993)
• Outgoing server address and port (usually SMTP on port 465 or 587)
• The encryption setting (SSL/TLS)
• Your full email address as the username, not just the part before the @

That last one trips up more people than anything else. A lot of mail apps assume your username is "sarah" when the server wants "sarah@yourbusiness.com."

Many services now support automatic setup, where you type your email address and password and the app fills in the rest. Try that first. If it fails, enter the settings by hand using the list above.

Once it works on one device, write those settings down somewhere you'll find them again. A note in your password manager works. You'll be entering them three more times.

Phone and tablet: use the built-in mail app or your provider's app

Both options work. The difference matters less than people think.

The built-in mail app on your phone puts work and personal mail in one place, which is either convenient or a recipe for answering a customer at 11pm. Your provider's own app keeps business mail walled off and usually handles things like shared calendars and out-of-office more gracefully.

Pick one and use the same choice on every mobile device so your experience doesn't change when you switch screens.

Two settings to check on mobile, because the defaults are rarely right:

Sync frequency. "Fetch every 30 minutes" means a customer emails at 9:01 and you see it at 9:30. Set it to Push if your provider supports it, or every 15 minutes at the longest.

Folders to sync. Phones often sync the inbox only, to save space. If you file everything into project folders, you'll want those syncing too, or you'll look like you've lost half your mail the moment you leave your desk.

When something won't sync, check these four things

You can receive but not send. Almost always the outgoing server. Check the SMTP port and make sure authentication is turned on, with the same username and password as incoming.

The password keeps getting rejected. If you have two-factor authentication on the account, most mail apps need an app-specific password instead of your normal one. You generate that in your account's security settings.

Duplicate messages everywhere. Usually a second account configured on the same device, often one POP and one IMAP. Delete the POP one.

Old mail missing on a new device. Mobile apps often sync only the last 30 days by default. Change the sync window to "All" or "No limit" and give it a few minutes to catch up.

Takeaways

• Use IMAP (or Exchange) on every device so your mail stays in sync instead of scattering.
• Your username is usually your full email address, including the part after the @.
• Set mobile sync to Push or 15 minutes, and make sure your folders sync, not just the inbox.
• Two-factor accounts often need an app password, not your regular password.
• Write your server settings down once. You'll use them on every device you add.

If you're still running business mail through a free personal address, syncing it across devices just spreads the problem around. Mail at your own domain costs a few dollars a month, works the same way on every device, and looks like a real business the moment someone sees it in their inbox. Register the domain and set up professional email together, then run through the steps above once per device.