Email for owners of multiple LLCs

If you own several LLCs, give each one that deals with customers, tenants or suppliers its own domain and addresses, and read them all from one inbox. We know of no rule that each LLC needs its own email account; what matters is that every company’s mail is clearly its own and can be separated later. For one owner with 3 LLCs, that is one mailbox: $36 a year on SuperMailOS Pro, against $10 on Purelymail, $19 on Migadu, $84 on Google Workspace, $84 on Microsoft 365. Prices are from each provider’s own pages, billed yearly, in US dollars before tax. Nothing here is legal or tax advice.

Does each LLC need its own email domain?

A domain per company is the default worth paying for: an LLC exists to be separate, and its domain is the one thing about its email that can be handed to a buyer intact. Every domain needs its own MX, SPF, DKIM and DMARC records; on SuperMailOS they come from the mail server’s own zone and are checked before the domain can send.

Is a separate email account legally required for each LLC?

Not that we know of. When a court decides whether to hold an owner personally liable for a company’s debts (“piercing the veil”), the factors it weighs are things like mixing personal and company assets and undercapitalisation, as Cornell Law School’s Legal Information Institute summarises. How email is set up isn’t on that list. What separate addresses do is keep each company’s contracts, invoices and notices visibly from and to the right entity. Your attorney or accountant knows your structure; ask them before relying on any of this.

Should all your LLCs share one email account?

• One account for every LLC means one login, one inbox and one bill. On SuperMailOS every domain sits in one workspace, and replies leave from the address each message was sent to.
• One account per LLC means each company has its own admin and its own bill, at the cost of signing in to each. On SuperMailOS, a login belongs to one workspace, so a workspace per LLC means a login per LLC.

Which LLC pays? One bill that serves several companies is paid by one of them. If that matters to how you keep the books, ask your accountant how to record each company’s share; if each LLC must pay its own way, give each its own account.

What does email for several LLCs cost?

One owner, 3 LLCs, two addresses on each, billed yearly. “Separate” is one account per LLC on the plan that fits a single domain:

Purelymail and Migadu cost less than SuperMailOS in one account; Zoho Mail’s Forever Free plan costs nothing if each LLC has its own account, since it covers up to 5 users on 1 domain, without IMAP, POP or ActiveSync. Fastmail isn’t priced because we couldn’t verify its US-dollar prices. With a bookkeeper too, five LLCs and both of you signing in, SuperMailOS is $120 a year on Business ($5 a person a month, unlimited domains); the email cost calculator prices other mixes.

Who can read which LLC’s mail?

Each person who signs in is one mailbox. Add the property manager for one LLC as a member (not an admin) and give them access to that company’s shared mailbox, leasing@ say, to read, send or manage it; members see only their own mailbox and what’s shared with them. A shared mailbox counts as one mailbox however many people use it, and giving access costs nothing extra. Role addresses such as invoices@ and notices@ are free aliases on every domain, so a new LLC never adds an address fee.

How do you keep the companies apart in practice?

• Reply from the company the mail was for. Answering one LLC’s tenant from another LLC’s address tells them the two are connected. So can Gmail’s “Send mail as”: Google notes recipients may see “from yourname@gmail.com on behalf of” the other address, and it ends for non-Google addresses in January 2027 (what to do instead).
• Register each domain in a login you control. Whoever holds the registrar account controls the company’s email.

What happens to an LLC’s email when it’s sold or closed?

1. Sold: the domain goes with the company. Export its mailboxes (or let the buyer’s provider copy them over IMAP), point MX and SPF at the buyer’s provider, replace the DKIM record, and remove the domain from your workspace. The other LLCs carry on unchanged.
2. Closed: keep the domain registered and receiving for a while. Banks, insurers and tax authorities can write months after the last invoice, and a lapsed domain can be bought by someone else, along with any mail still sent to it. The same logic is in how to move email to a new domain.
3. Merged: make the absorbed company’s addresses free aliases of the surviving company’s mailboxes, so old contacts still reach you.

When is SuperMailOS the wrong fit for several LLCs?

• Each LLC must be billed separately and you don’t want a login per company. SuperMailOS bills a workspace, not each domain in it.
• The companies live in a suite. If they share documents and calendars in Google Workspace or Microsoft 365, the per-user price buys more than mail.
• Price is all that matters. Purelymail and Migadu cost less, and Zoho’s free plan covers one domain per account.

Where do these facts come from?

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