SUMMARY *** When I try to fetch mails from my GMail account I get the error message "Unable to login to the server \"pop.gmail.com\".\nCould not login to pop.gmail.com. The password may be wrong.\n\nCould not send to server.\n". *** STEPS TO REPRODUCE 1. Make a GMail account and activate POP3 in the account settings. 2. Add the respective POP account in KMail: - Incomming mail server: pop.gmail.com - Username: <yours@gmail.com> - Password: <GMail passord> - SSL/TLS Port 995 with Authentication "Clear Text" 3. Fetch your E-Mail with this account in KMail. OBSERVED RESULT (Error log) org.kde.pim.pop3resource: ============== ERROR DURING POP3 SYNC ========================== org.kde.pim.pop3resource: "Unable to login to the server \"pop.gmail.com\".\nCould not login to pop.gmail.com. The password may be wrong.\n\nCould not send to server.\n" org.kde.pim.pop3resource: UID list from server is not valid. org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f9d082c6770) ) org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f9d082c6770) identified as "CollectionDialogMonitor - 94913249806016" org.kde.pim.akonadiserver: Subscriber "CollectionDialogMonitor - 94913249806016" disconnected org.kde.pim.pop3resource: ============== ERROR DURING POP3 SYNC ========================== org.kde.pim.pop3resource: "Unable to login to the server \"pop.gmail.com\".\nCould not login to pop.gmail.com. The password may be wrong.\n\nCould not send to server.\n" org.kde.pim.pop3resource: UID list from server is not valid. EXPECTED RESULT New e-mails arrive. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: KDE Plasma Version: 5.25.4 KDE Frameworks Version: 5.96.0 Qt Version: 5.15.5 ADDITIONAL INFORMATION - This error persists for several months now and was present in earlier versions of KMail, too (not sure which one). - I tried every authentication method and also TLS without success. - It looks like pop.gmail.com doesn't recognize my password anymore. My password is a combination of uppercase, lowercase letters, digits and special characters like *.
I think I found the reason for my problem: "To help keep your account secure, from May 30, 2022, Google no longer supports the use of third-party apps or devices which ask you to sign in to your Google Account using only your username and password." I guess, KMail needs to support OAUTH2 in order to access Google's POP3 server.