Updated FAQ

FAQ.md

@@ -68,6 +68,7 @@ For authorizing:
 * Apple iCloud, see [question 148](#faq148) ([German](https://support.apple.com/de-de/HT204397))
 * Free.fr, see [question 157](#faq157)
 * Posteo: please check if [additional email account protection](https://posteo.de/en/help/activating-additional-email-account-protection) ([German](https://posteo.de/hilfe/zusaetzlichen-postfachschutz-deaktivieren)) isn't enabled
+* Posteo: in some cases you need to use [an app password](https://posteo.de/en/help/app-passwords) ([German](https://posteo.de/hilfe/anwendungs-passwoerter))
 * Posteo: not that there is [no spam folder](https://posteo.de/en/help/how-does-the-posteo-spam-filter-work) ([German](https://posteo.de/hilfe/wie-funktioniert-der-posteo-spamfilter))
 * Posteo: if you want to synchronize contacts, please [see here](https://posteo.de/en/help/how-do-i-set-up-synchronisation-of-contacts-with-an-android-address-book)
 * Web.de: please check if [IMAP is enabled](https://hilfe.web.de/pop-imap/imap/imap-serverdaten.html)

index.html

@@ -94,6 +94,7 @@
 <li>Apple iCloud, see <a href="#faq148">question 148</a> (<a href="https://support.apple.com/de-de/HT204397">German</a>)</li>
 <li>Free.fr, see <a href="#faq157">question 157</a></li>
 <li>Posteo: please check if <a href="https://posteo.de/en/help/activating-additional-email-account-protection">additional email account protection</a> (<a href="https://posteo.de/hilfe/zusaetzlichen-postfachschutz-deaktivieren">German</a>) isn’t enabled</li>
+<li>Posteo: in some cases you need to use <a href="https://posteo.de/en/help/app-passwords">an app password</a> (<a href="https://posteo.de/hilfe/anwendungs-passwoerter">German</a>)</li>
 <li>Posteo: not that there is <a href="https://posteo.de/en/help/how-does-the-posteo-spam-filter-work">no spam folder</a> (<a href="https://posteo.de/hilfe/wie-funktioniert-der-posteo-spamfilter">German</a>)</li>
 <li>Posteo: if you want to synchronize contacts, please <a href="https://posteo.de/en/help/how-do-i-set-up-synchronisation-of-contacts-with-an-android-address-book">see here</a></li>
 <li>Web.de: please check if <a href="https://hilfe.web.de/pop-imap/imap/imap-serverdaten.html">IMAP is enabled</a></li>