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Dear Posteo Customers,

We’re adding to our offerings for end-to-end encryption and email signing: effective immediately you can use our service to easily obtain inexpensive S/MIME certificates for your Posteo email addresses with a single click.

S/MIME is a standard for end-to-end encryption that is used around the world and is already integrated into many email clients. An S/MIME certificate issued by a recognized certificate authority is displayed as trustworthy in email clients – and verifies the authenticity of an email address and the contents of an email. That means: more security in email communication.

For private users, obtaining certificates has for years been relatively complicated and cost-intensive, even though S/MIME certificates can play an important role in ensuring secure communication across email platforms. We want to encourage the use of S/MIME, and so effective immediately we are offering inexpensive certificates for your Posteo address(es) that you can create with just one click and start using right away. The S/MIME certificates come from a recognized certificate authority (Certum); emails signed with the certificates are displayed as trustworthy in email clients. The certificates are valid for one year and cost €3.65. You will be notified before the expiration date and given the option to renew. Certificates can also be obtained for aliases. You’ll find the new option in Settings under “My S/MIME certificates”.

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To sign your emails with S/MIME, only you need a certificate; for encryption all recipients must also be using S/MIME. S/MIME works with almost all email clients (such as Thunderbird, Apple Mail, and Outlook) and effective immediately you can start using certificates obtained through Posteo with these clients.

We are currently at work on a browser plug-in for Posteo webmail and the Posteo web app. With this plug-in you’ll be able to sign your emails directly in Posteo webmail and the web app. You’ll also be able to encrypt and decrypt emails – without us, the email provider, storing your private key on our servers. This is the only way to ensure real and trustworthy end-to-end encryption.

S/MIME signatures are already verified and displayed in Posteo webmail and the Posteo web app. Some large companies, like DHL, and some government agencies as well have begun signing their emails with S/MIME, so that you can recognize the authenticity of an email at a glance.

For those interested in the technical details: here’s what happens when you generate a certificate “with a single click.”

Certificates are not server-generated at Posteo: if you create an S/MIME certificate in Settings, a key pair is automatically generated locally in the browser on your device. Your browser then generates a certificate signing request, and only this request (not the private key) is transferred via Posteo to the certificate authority (Certum), where it is signed and sent back, again via Posteo, to your browser. The browser then saves the certificate together with your private key in a file on your computer’s hard drive. The certificate can be installed in email clients. To do so you will need the installation password provided when you created the S/MIME certificate – please store it in a safe place. Throughout this process the private key continues to be stored locally on your device at all times. Or to put it another way: private keys, which are used to sign and decrypt emails, are never at any point in time available to either Posteo or the certificate authority (Certum) and are not saved by Posteo. To reiterate: This is important, because real end-to-end encryption means the email providers never have the end users’ private keys.

Best regards,
Your Posteo Team

Dear Posteo customers,

We are updating our main security certificate. Security certificates are only valid for a specified time period and need to be renewed from time to time.

In most cases, you will not notice any change.
All current clients like Thunderbird or Outlook will automatically find the new certificate. You do not need to do anything. However, should your client display a certificate error during this changeover process, please restart your client. This should fix the error.
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If you manage the trustworthiness of certificates manually, you can find the fingerprint for the new main certificate below. You can also find complete fingerprints for all certificates in our legal notice.

New fingerprint for the TLS security certificate for posteo.de:

Geotrust:
SHA256: AA:FC:E1:21:F4:15:14:E6:8D:09:ED:F4:87:EA:E6:1E:02:99:BC:9B:41:51:4C:FC:DC:BE:F5:E8:A5:60:9C:DD
SHA1: ED:87:9A:C6:E6:2E:72:82:42:AD:30:D9:05:38:30:34:7C:47:2F:24

Best regards,
The Posteo Team

Dear Posteo customers,

We are expanding our range of services: From now on, accounts can also be registered with the email domain @posteo.com. Additionally, we offer the domains @posteo.us, @posteo.ca, @posteo.uk, @posteo.ie, @posteo.es, @posteo.at, @posteo.ch, @posteo.nl, @posteo.be, and @posteo.lu.

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Previously, accounts could only be registered with either @posteo.de or @posteo.net endings. Many of you have asked for these additional options.

If you prefer one of the new domains for your existing account, you can now rename it easily in the settings via “Email aliases”. Your previous address will then be converted into an alias, so that you can continue to receive emails to that address.
If necessary, you can find further information in our help section.

There are many other top-level domains (the address part after “@posteo.”) also available for Posteo email aliases, such as .me or .eu.

By the way: Your Posteo address can only be registered by you for the other Posteo domains. For example, if you have the address mymail@posteo.de, only you can register the address mymail@posteo.com.

Best regards,
Your Posteo Team

Dear Posteo customers,

We have released two new spam options. From now on, you can manage your mailbox with or without a spam folder – or use the spam log. The new options can be activated or deactivated in your account settings. Allow us to introduce them to you.

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If you do not use a spam folder, emails that have been classified as spam are rejected and the sender is informed of this rejection. You save time in your daily routine as there is no spam folder that must be checked regularly and sorted through. Because from a legal point of view, emails in a spam folder are also generally considered as delivered. Additionally, your email address becomes considerably less enticing for spammers if their potentially dangerous digital trash is regularly rejected.

Attempts to reach out to someone are also often overlooked in spam folders or noticed much later. This is the reason why the Snoop Dogg song “Chai Tea with Heidi” almost didn’t exist because Heidi Klum overlooked an email sent by the rights holder, Rod Stewart, for almost two months in her spam folder. Email clients like Thunderbird, Outlook or smartphone apps may even automatically delete emails in spam folders after a short period of time. Therefore, please be sure to check the settings for deleting emails in your programs if you use a spam folder. Otherwise, communication could be lost. We do not delete emails from the spam folder.

Spam folder: Receive all spam emails

Whoever decides to use the optional spam folder can check there at any time which emails have been classified as spam by us. All spam emails will be delivered in this folder.

From a customer service perspective, we know that it is very uncommon for spam to be falsely classified and is mostly only suspected. If an expected email is missing, in most cases it turns out that either the email address was misspelled or the message was sent to another email address. Often the email in question arrives shortly thereafter. Sometimes customers have also activated a filter that immediately sorts incoming emails to subfolders or deletes them. Or they use external email clients that sort emails into their own spam folders. Sometimes, it’s just that the inbox has also been accidentally sorted differently – and incoming emails are not longer displayed as usual.

Please check the scenarios described above if you have activated the spam folder and suspect that an email has not been received. From a technical standpoint, you can be sure that we deliver all emails sent to your mailbox, even if they have been classified as spam.

Activating the spam folder can lead to your email address becoming considerably more attractive for spammers – and result in you receiving more spam. Therefore, you can also temporarily activate your spam folder as needed. For example, during a period where you are sending off job applications and want to be absolutely sure that nothing can go wrong under any circumstance or that something may need to be clarified first.

Steer a middle course with the spam log

Are you not interested in managing a spam folder but still want to know which emails are rejected? Then, as an alternative to the spam folder, you can activate our new spam log.

By doing so, potentially dangerous spam emails will continue to be rejected. We also document each rejection for you transparently in a spam log folder. The log contains details about the sender, date, time and subject (if applicable) of the rejected email and is created in real-time. Warning: Sender names are often falsified by spammers.

Should you suspect that an email has been incorrectly rejected, you can check the log and know with immediate certainty.

Be careful with spam

Regardless of whether you decide for or against a spam folder: Always be careful when dealing with suspicious emails. Never click on links or open attachments in such emails and never answer them. In general, legitimate senders do not request that you click on links and then enter login credentials or other data. For your security, images are not loaded in the spam folder and clicking on attachments and links is deactivated in the Posteo interface and our web app. If you move the email to another folder, contents can be loaded and clicked on as usual.

If a sense of urgency is suggested or pressure is exerted, it is often a clear indication of spam or phishing. This rule of thumb helps: Never give in to such harassment. If you are unsure, you can always first contact our free customer support. We can advise you how to deal with suspicious emails. There are also no dumb questions: Even IT professionals can become unnerved by well-made spam emails and will contact us. Our team always takes you seriously.

Best regards,
Your Posteo Team

Dear Posteo customers,

Starting today, we will be gradually releasing new features for you: Just in time for the beginning of spring we are bringing some color to your mailbox – we are now offering our user interface in 10 new variants. Additional updates include dark mode as well as two levels of contrast.

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Regardless if you prefer yellow, pink, red or neutral colors like beige, brown or blue: From now on, the color of the user interface can be adjusted in the settings. The selected color will be applied to all areas, such as the calendar, notes, the attachment browser or in the Posteo web app.

Each Color in Two Contrast Levels

It is also new that all color variations are now available in two contrast levels. If you regularly work several hours in front of a screen, a color and contrast selection tailored to their own needs can be much more pleasant. Please try it out!
The contrast toggle switch can be found in the settings directly above the color selection.

Dark Mode

Another update: Starting now, you can activate dark mode. The background will then be displayed darkened and the text brightened – in the color you have selected. dark mode is especially useful for reading emails in darker settings. Many people also consider this more pleasant on the eyes in general.

Additionally, you have the option to automatically control Light and dark mode based on your operating system settings: The Posteo interface will then adapt accordingly – also on smartphones using the web app.

There is a toggle switch for dark mode and auto dark mode directly above the color selection.

We will gradually release all new features over the next few weeks. As soon as they have been released for your account, you will find the new options in Preferences via “User Interface”. These features are available free of charge without any further action on your part.

Video and Help Guides

In our video, you will learn how to select your personally favorite color and contrast level – and how dark mode works. There are also versions of the video available in French and German.

You can find step-by-step guides in our help section here:
How do I change the color of the Posteo webmail interface?
How do I activate dark mode for my account?
How do I install the Posteo web app?

Best regards,
Your Posteo Team