https://bugs.kde.org/show_bug.cgi?id=373870
--- Comment #3 from [email protected] --- I have changed to kmail version 5.7.1 (KDE 17.12.1) and the problem persists. I think the following error messages might point to the source of the problem: --- kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "smtp" org.kde.pim.mailtransport: Transport with this ID not managed by transport manager. --- I figured out that kmail uses the proxy server to reach SMTP servers, and mine (squid) was blocking this from going through. So I had to add a whitelist of servers to the squid configuration: e.g. --- http_access allow whitelist http_access allow CONNECT whitelist --- where whitelist is the acl for the servers. This might be potentially risky, but it is the only workaround I could find. -- You are receiving this mail because: You are the assignee for the bug.
