Gmail, Outlook, T-Online and Onet: When a National Provider Is Actually the Answer

Four names come up constantly on mailbox shelves. Two of them are global products almost everyone recognises. Two are national providers whose search demand is almost entirely in German and Polish respectively, which means most English readers meet them for the first time on a listing.

The interesting question is not which is best. It is that these four price the same feature in opposite directions, and knowing which direction tells you where your money is going.

The comparison that matters

	How you connect	What protocol access costs	Listings with no usable warranty window
Gmail	App password, or the API via OAuth2	Cheapest attribute on the hub	Around a sixth
Outlook	OAuth2 only	Below the middle price	Around a quarter
Hotmail	OAuth2 only	Effectively zero	Around a tenth
T-Online	Login and password	Included on the free tier	Around a fifth
Onet	Web only unless paid or grandfathered	Nearly twice the middle price	Around three in ten

That last column ranges from a tenth to three in ten, which is a bigger practical difference than most of the feature comparisons people spend time on.

Protocol access, priced three different ways

This is the finding worth carrying away, because it contradicts the instinct that a feature costs roughly the same wherever you buy it.

• Effectively free. On the Hotmail shelf, both OAuth2 and IMAP tags sit at essentially zero against a middle price well over a dollar, while verification attributes on the same shelf run near double. Access is given away; being verified is what costs.
• Included and unremarkable. T-Online's free tier carries IMAP, POP3 and SMTP with no upgrade, and eighteen of its roughly twenty listings have the tag. There is nothing to optimise.
• The expensive option. On Onet it costs nearly twice the middle price, and it is the only shelf in the catalogue where that is true. Not a markup, but a consequence: Onet moved IMAP behind its paid tiers during 2026 and discontinued POP3 for free accounts, so listings that genuinely have it are scarce.

So a habit formed on one shelf actively misleads on another. "Do not pay extra for IMAP" is correct three times out of four here and expensive advice on the fourth.

Authentication, which is where the real work is

Gmail wants an app password for mail clients, and you cannot generate one until two-factor is enabled, which is the single most common stumbling block. For software, the Gmail API through OAuth2 gives scoped permissions at the cost of a project setup.

Outlook and Hotmail ended basic authentication for personal accounts on 16 September 2024, so plain credentials no longer connect at all. Everything is OAuth2, which is why those listings deliver refresh tokens and client ids rather than passwords. The thing to check is completeness: a refresh token without its client credentials works until the current access token expires and then stops permanently.

T-Online is the simple one. Plain login and password, protocols on the free tier, nothing to configure beyond server settings.

Onet is the constrained one, and the question is which tier an account is on before anything else.

Two shelves, one company

Worth stating plainly because it is money left on the table. Outlook and Hotmail are the same Microsoft mailbox on two shelves, and the Outlook shelf's middle price is roughly a twentieth of the Hotmail shelf's.

The reason is visible in the tags: the Outlook shelf is almost entirely the protocol tier, with OAuth2 on two thirds of listings at below the middle price, while the Hotmail shelf carries the verified tier, with two-factor and filled profiles at close to double its own much higher middle. Two different products under one company's name.

If what you want is a mailbox to connect a client to, checking both shelves costs nothing and the gap is large. If what you want is a verified account, the cheap shelf mostly does not stock it.

When a national provider is actually right

The honest case is narrow, and it is not about quality.

It is when the service you are signing up to treats a domestic address differently, either through explicit rules or through whatever it infers. That is a real phenomenon and it is why these shelves exist. It is also worth verifying before buying rather than assuming, because it is easy to pay a premium for a signal that is not being read.

Two constraints come with the choice. Both providers expect sign-ins consistent with their region, so a mismatched location is the ordinary trigger for extra verification. And both shelves are small: T-Online has around twenty listings with roughly eleven in stock and one supplier holding about half, which is the weakest concentration measured on any mailbox shelf.

Choosing, in one line each

• Widest acceptance, and a client to connect: Gmail, with an app password.
• Cheap mailboxes in quantity for tooling: the Outlook shelf, on OAuth2, and check the grant is complete.
• A verified account you will keep: the Hotmail shelf, where the verification tier lives, at the price that implies.
• A German-reading address: T-Online, accepting a small shelf and a European sign-in.
• A Polish-reading address: Onet, checking the tier first, because a free-tier account is web-only now.

All of these sit under the email hub, where the protocol and verification tags are filterable across providers.