update README

README.md

@@ -59,17 +59,15 @@ configuration is needed.
 Our current email setup is somewhat involved. You **receive** emails on your
 `<username>@fsfe.org` address at the email address you specified at
 https://my.fsfe.org as your for 'Primary email'. If you are a staffer at the
-FSFE, it is likely that we already created a paid account for you at
-https://mailbox.org which is a German email provider we trust. A username and
-password will have been provided to you when you received your laptop. Please
-make sure you can login at https://mailbox.org with these credentials. Next,
-please open Thunderbird and use the same credentials to setup your email
-account. [This
+FSFE, we created an account for you on our IMAP server. The account is
+associated with your FSFE account. Next, please open Thunderbird and use
+the same credentials to setup your email account. See this [article on setting up Thunderbird with your FSFE account](https://docs.fsfe.org/en/internal/services/email/fsfe). In addition [this
 article](https://kb.mailbox.org/en/private/e-mail-article/setup-with-mozilla-thunderbird)
 might help you do that.
 
-If you want to be able to send mails from your `<username>@fsfe.org` email
-address from Thunderbird, you need to add a second identity.
+If FSFE did not provide you with an IMAP account at the FSFE servers
+and you want to be able to send mails from your `<username>@fsfe.org`
+email address from Thunderbird, you need to add a second identity.
 
 For this follow the steps below:
 
@@ -96,7 +94,7 @@ set to `matrix.fsfe.org`. Otherwise this will not work.
 
 ![Matrix Login Page](./img/matrix.png)
 
-Once you are logged in you can ping me (`@linus:fsfe.org`) or matthias
+Once you are logged in you can ping me (`@tobiasd:fsfe.org`) or matthias
 (`@mk:fsfe.org`) so that one of us can add you to the Staff room or any other
 room that is access-restricted.