When to Upgrade Your Email Plan, and What Actually Changes

Plan comparison tables are written to sell the top tier, so they list everything and explain nothing. The useful question isn't which plan has the most features — it's which specific thing you'll hit first, and what it costs to stop hitting it. This page walks the boundaries in the order people actually reach them, so you can upgrade email plan tiers for a reason rather than a hunch.

The Four Tiers, Compressed

The First Boundary: Sending

The free plan receives but doesn't send through our servers. That's the wall almost everyone meets first, and it's the clearest reason to upgrade email plan tiers at all.

It's a hard boundary rather than a soft one — no allowance, no trial, nothing to run out of. If you need to reply from an address, you need a paid plan, and $4 a month is where that starts, or $3.50 a month billed annually.

The exception worth knowing is that a custom SMTP profile isn't plan-gated, so if you already own sending infrastructure the free plan can use it, described in custom SMTP per domain. That's a genuine escape hatch and not a workaround we mind, because the deliverability risk moves to you.

The Boundary That Surprises People: Filters

This is the one worth reading carefully, because it catches people who chose Starter reasonably and then discover the gap.

Mail filters are zero on Starter. Not fewer — none. Server-side rules that sort mail on arrival start at Pro with ten, rising to fifty on Agency. So anyone whose actual requirement is automatic sorting needs to skip Starter entirely, and the relevant upgrade email plan decision is a two-step jump rather than one.

People discover this after subscribing, because comparison tables list filters without making clear that the lower tier has none. Auto-reply is on Starter; filters are not, and the two get conflated.

If your sorting need is modest, client-side rules in Outlook or Apple Mail cover it without any upgrade — the difference being that those only run when the client is open, so mail isn't sorted on your phone.

Storage: the Quiet One

Storage is the limit most accounts reach eventually, and it's the one where the instinct to upgrade email plan tiers is usually wrong.

Moving from Starter to Pro buys 35 GB more for $6 a month. The Drive add-on buys 250 GB for $3.20. So if storage is genuinely your only constraint, the add-on is dramatically better value and you shouldn't upgrade email plan tiers at all.

The upgrade makes sense when storage arrives alongside something else you need — more filters, more shared mailboxes, more external accounts. Storage alone is the add-on's job, and the arithmetic isn't close.

Before doing either, check whether attachments are the cause, because they usually are and they're often duplicated several times over. That's covered in the attachment size limit.

The Three Reasons Agency Exists

The upgrade email plan step from Pro to Agency triples the price, so it's worth being specific about what justifies it. The biggest differences are scale and advanced control, not storage.

Domain count. A hundred to a thousand. If you're managing mail for clients, this is usually the reason.

More forwarding addresses. Mailbox-less addresses that deliver onward start on Pro at 100 per domain. Agency raises that to 300. Nano and Starter can save 25 while inactive, but delivery starts only after moving to Pro or Agency.

Raw Sieve. Writing filter scripts directly rather than through the interface. Agency only, and irrelevant to most people until it suddenly isn't.

Thirty shared mailboxes and thirty external accounts come along too, which matters for anyone reading mail on behalf of others.

The Limits That Rarely Bind

Two numbers get quoted in comparisons and almost never decide anything, which is worth saying so you don't upgrade email plan tiers chasing them.

Domain counts. Fifty domains on Starter sounds restrictive and isn't, because the overwhelming majority of accounts hold fewer than five. Unless you administer mail for other people, this number will not be your constraint.

Mailboxes per domain. A hundred on Starter covers any business that isn't giving addresses to non-employees. The ceiling matters for membership organizations and for anyone attaching addresses to things rather than people, and for everyone else it's decoration.

Daily sending limits sit in the same category — 1,000 messages per mailbox per day on Starter is far beyond ordinary correspondence, and anything approaching it is a volume-sending workload that belongs on separate infrastructure regardless of tier.

How to Decide

Rather than comparing tables, answer four questions in order and let them decide whether to upgrade email plan tiers.

Do you need to send? If yes and you have no relay of your own, that's Starter at minimum.

Do you need mail sorted before you see it? If yes, that's Pro. Not Starter.

Are you managing mail for other people? If yes, count the domains and forwarding addresses. Pro covers up to a hundred domains and a hundred forwarding addresses per domain; above either number, choose Agency.

Is storage the only thing you're short of? If yes, buy the add-on and stay where you are.

That sequence gets most people to the right answer in a minute, and it avoids the common mistake of upgrading for storage when the add-on was three times cheaper.

Changing Your Mind

An upgrade email plan change takes effect on the account you already have — domains, mailboxes and stored mail stay exactly where they are, and the new limits simply apply.

Reversing an upgrade email plan decision needs more care, because the lower tier's limits have to be satisfiable. If you're over the new plan's mailbox or domain count, that has to be resolved first, and mail in excess of the smaller storage pool is the awkward case. The sensible order is reducing what you hold, confirming you're inside the target tier's limits, and only then changing the plan.

Annual billing on Agency is $279 rather than $348, which is worth taking if you're confident the tier is right. It's less worth taking while you're still finding out.