We create IMAP accounts for Yahoo within the mail accounts wizard instead of using POP3 which is not available for all accounts.
The change is done within plugin/com.openexchange.mail.accounts/services/config.js which is a config file in our packaging and therefore might need manual merging if that configuration was modified before.
The change is done within plugin/com.openexchange.mail.accounts/services/config.js which is a config file in our packaging and therefore might need manual merging if that configuration was modified before.