mailbox.org Login: Sign In, Sign Up and Password Reset

The mailbox.org login is a single form at login.mailbox.org. You type your email, press Continue and then give your password. The same account opens mail programs, calendars and cloud storage.

This guide lists each way in that we could check. It then covers the phone, mail programs, a second sign-in factor, sign up and resets. Every fact comes from mailbox.org's own pages and help articles, read in October 2026. We did not sign in or register, and we are not affiliated with mailbox.org. BillionVerify is an email verification service.

Key facts (checked October 2026):

• Per mailbox.org's login page, the login name is the complete address of your account, not only the part before the @.
• According to mailbox.org's guide on apps, the service has no dedicated store app and offers an installable web version.
• Per mailbox.org's setup guide, the mailbox.org IMAP server is imap.mailbox.org on port 993 with SSL/TLS.
• Per mailbox.org's pricing, the paid private plans start at 4 € a month when billed monthly, and Light is sold with annual payment only.
• According to mailbox.org, a reset only works if you saved a mobile number, an alternative address or a phone password before.
• BillionVerify's account gives 20 free credits on each day you use it, with no card needed, for checking addresses before a campaign.

Where the mailbox.org Login Starts

Several addresses belong to this single service. The table lists what we opened.

The main site also shows a "Login" link at the top. It leads to the same form.

The Form Itself

The mailbox.org login asks for the "E-mail address" first. Under the field, the service adds: "Please enter the full email address of your user account."

Screenshot: the sign-in page with the news column on the right.

Press "Continue" to move on. Below the button sits "Forgot password?", which opens the reset form.

Always Use the Primary Address

The page insists on a single rule. If you turned an alias into the main login, that alias is now your login name, and the former stops working. The rule covers the user forum and every other part of the provider.

Messages You May See

The form's own text lists four messages:

• "Login failed", with a hint to check your entries and whether you used the full email
• "Currently the login is not possible. Please try again later."
• "Access from this network is not allowed"
• "Login disabled for 60 seconds"

The last message is a short pause after wrong entries. Wait a minute, then try the mailbox.org login again.

mailbox.org App: The Web Version on Your Phone

There is no dedicated mailbox.org app. The provider's guide says so and offers a Progressive Web App instead. It has its own icon and opens in its own window. Think of it as the mailbox.org app for people who skip the store.

Log in first in your browser, then install the web version.

Android

1. Visit the site in Chrome or another Chromium browser and log in.
2. Tap the three-dot menu at the top right.
3. Choose "Install app", or the shortcut entry some browsers show instead, then confirm.

Firefox for Android works too. Open its menu, tap "Install" and pick where the icon goes.

iPhone and iPad

1. Open the site in Safari and log in.
2. Tap the Share icon in the bottom bar.
3. Choose "Add to home screen", label it and tap "Add". The mailbox.org app icon then sits among your other apps.

The guide warns that iOS supports push notifications for such apps only to a limited extent.

A Normal Mail App Works Too

You can read mail in the programs that came with your phone. The service has setup guides for Thunderbird on Android, the iOS Mail app and the macOS Mail app. It also covers Exchange ActiveSync on Android and iOS. The next section gives the server names.

mailbox.org IMAP and SMTP Settings

Most modern programs find the settings alone from your login details. If yours does not, type the values in by hand.

mailbox.org IMAP Server Settings

The service calls POP3 an older, simple protocol. It fetches the inbox only and knows no folders. For folders or several devices, the service strongly recommends IMAP, so enter the mailbox.org IMAP server first. Both server types are secured with SSL/TLS.

mailbox.org SMTP Server Settings

Port 465 uses SSL/TLS, and the alternative port 587 uses STARTTLS. Use your full login as the username. Your normal login works unless the second factor below is on, which calls for an app password. For background on this kind of software, read what an email client is in our glossary.

Programs on the Compatible List

For browsers the list names Chrome, Firefox, Edge and Safari, and recommends Firefox.

If a Program Cannot Connect

Two causes come up most. Some Telekom routers block standard ports through a "Secure Mail Servers" function that does not list mailbox.org SMTP. Some security suites scan mail and close ports, and the only fix on offer is to turn the scan off.

The firewall is a third cause. After many failed connections, it can block a connection for about 15 minutes. Programs that guess server names by themselves can set it off. Type the mailbox.org SMTP and IMAP server names by hand instead.

Two-Factor Sign-In

The service offers a time-based code from an authenticator app (TOTP). It also offers an OTP method that it calls Login 2.0.

Turn On TOTP

1. Click the gear icon and open All settings, Security, Two-factor authentication.
2. Enter a device name.
3. Scan the QR code with your authenticator app.
4. Type the six-digit code and click "Check code and activate TOTP".

Google Authenticator, Bitwarden and FreeOTP serve as examples. From then on, the mailbox.org login needs the current code too.

What Changes Afterwards

Mail programs, calendar apps and sync tools can no longer use your normal login. Create a separate app password for each of them in the settings. The page shows it once, so copy it right away. Mail clients can also get a key limited to IMAP, SMTP or both.

Two warnings apply. Lose your authenticator, and only the administrator can reset your password. Any reset also switches the second factor off, so set it up again.

Sign Up for a mailbox.org Email Account

New accounts start on the price page. Pick a private plan and press "Try it for free". The form opens under the heading "Choose your preferred address".

Screenshot: step 1 of the sign up at register.mailbox.org.

It has two steps, "Set up account" and "Open account". We only looked at the first. It asks for the part before @mailbox.org and a matching entry typed twice.

Private Plans and Prices

Every new customer gets a trial of 30 days at no cost. After that you pay ahead, and the credit you load sets how long the plan runs. The price page lists these plans in euros including VAT, as of October 2026:

Screenshot: the private plans on the price page, with monthly billing selected.

Light has 3 aliases and limited support, which covers contract, credit and recovery questions. Each mailbox.org email carries the @mailbox.org ending. Standard and Premium both have 25 aliases and allow custom domain names. Business plans carry other prices on the same page.

Limits During the Trial

To stop abuse, mailbox.org restricts unpaid test accounts:

• up to 10 emails per day, sent only to other mailbox.org users
• restricted receipt from some outside senders, such as social media, payment services and verification codes
• 100 MB of mail storage and 10 MB of cloud storage

A payment lifts every limit. A trial account is deleted after 30 days if nothing was paid, with no cancellation needed.

Save Recovery Details Now

After sign up, a "Secure login" box offers to store a mobile number or an alternative address. Do it at once, because the recovery below depends on it.

Forgot Your mailbox.org Password?

Press "Forgot password?" on the form or open the recovery page, titled "Request a password reset". It runs in three steps: enter the email, reset, set the replacement.

Screenshot: the first reset step at register.mailbox.org.

Check Three Things First

The page lists them before you start:

• Type the primary address in full, such as [email protected].
• After an alias swap, use the new address.
• With one-time sign-in, the first factor is not the usual login but the PIN chosen during setup.

The Reset Steps

1. Enter your login email and click Continue.
2. Pick a method from those you stored: an SMS code, a mailed code, or the phone password.
3. Enter the code, type a replacement and click Send.

The phone route shows a number to call on weekdays from 9:00 to 18:00. You confirm it there and pick a fresh login afterwards. The guide adds that this number offers no other support.

No Stored Details, No Reset

The service holds no personal data about you beyond what you enter. It cannot tell a real name from a pseudonym. Without stored recovery details, it cannot confirm who you are, and the guide marks this as a danger.

Add the details later through the gear icon, All settings, Security, Login recovery. Allowed characters are letters, digits and these symbols: ! $ " % & / ( ) = * + - # . , ; : @ ? [ ].

When the mailbox.org Login Fails

The guide lists seven checks. Test after each step.

1. Look for an outage on the form or in the user forum.
2. Reload the page or restart the browser.
3. Clear cache and cookies.
4. Open a private window.
5. Try another browser.
6. Try another device.
7. Try another internet connection.

Still stuck? Write to [email protected] or use support.mailbox.org. Include your operating system, browser or mail program with versions, the exact error text and the tests you ran.

A common error hits trial users who send outside the service: "554 5.7.1 Relay access denied". Trial accounts cannot send to outside recipients, and a payment ends that.

Cancel an Account

Most accounts end by themselves. The contract lasts as long as your credit, and it stops when you do not renew. To cancel earlier, use the form under All settings, Contract and payment, Contract. There is no refund for the unused term.

If you only want a new primary address, add an alias and promote it. After a cancellation, the mailbox name and its aliases stay blocked for 90 days at the very least.

Emailing mailbox.org Users? Verify Before You Send

Not every reader owns a mailbox here. Some of you collect a mailbox.org email in a signup form or write to those users in a campaign. Two facts matter for your list. A single mailbox can hold several aliases, so two entries may reach the same person. A new trial account also refuses some mail from outside senders.

The BillionVerify email verifier checks that the domain, the mail route and the mailbox exist.

BillionVerify's email verifier works on single entries and on lists. What to know:

• valid and invalid results cost 1 credit each, and unknown results are free
• a free re-check is available within 24 hours
• catch-all entries get their own label and are not counted as valid
• the free allowance is 20 credits per day of use, up to 600 a month, and credits never expire
• our servers are in France (EU), and a DPA can be signed
• you can use a REST API, an MCP server or one of 25+ integrations

We make no claim about how the service's servers answer checks. If you also collect mobile numbers, our phone number checker shows whether a number is valid for its country. If a message claims to come from mailbox.org, our reverse email lookup shows the domain behind the sender. For other German providers, see our guides to the WEB.DE login and the T-Online mail login.

FAQs

What does a mailbox.org email look like?

A mailbox.org email ends in @mailbox.org, and the provider runs the website of the same name. Its own pages now call the service just "mailbox". Your login name is the whole address before and after the @.

Does a mailbox.org email cost anything?

The service is paid after a trial. The trial runs 30 days, opens all features and limits sending and storage. Afterwards Light is the cheapest option, with annual payment.

Is there a mailbox.org app for Android and iPhone?

mailbox.org has no native store app. You add the web version through the browser menu, on Android or iOS. Another route is a mail program on IMAP, such as Thunderbird.

Should I choose mailbox.org IMAP or POP3?

mailbox.org recommends IMAP for folders and for several devices. POP3 only downloads the inbox, without folder support. Use pop3.mailbox.org only for a download-only setup.

Which port does mailbox.org SMTP use?

mailbox.org SMTP listens on port 465 with SSL/TLS, and on port 587 with STARTTLS. The server name is smtp.mailbox.org for both. The username is the full primary address.

Why does my mail program refuse my login?

A mail program asks for an app password once the second factor is on. The normal login stops working there. Make a new key in the security settings, or a key that only allows mail transfer.

Can mailbox.org help without recovery details?

mailbox.org cannot do a reset when no recovery details were stored. It cannot confirm who owns the account otherwise. Saved details can be an SMS number, a second email or a telephone password.

How long is a deleted address blocked?

A cancelled account leaves its address and aliases locked for a period of 90 days or more. The exact period depends on the plan and the age of the account. Until then, nobody can log in with those names.