I use e.email with Thunderbird on Windows 10 Professional 64 bit and with ProfiMail Go on Android. Server settings are equal in both apps. This worked for quite a while.
Now with ProfiMail Go (Android) I receive error message when trying to connect to IMAP or SMTP: failed to connect to mail.ecloud.global/2a01:4f9:c010:c4fd::1 (port 993) from ... after 10000ms: isConnected failed: ECONNREFUSED (Connection refused)
With Thunderbird (Windows) connection works but email provider T-Online refuses to accept messages: Mail system at host mail.ecloud.global posts this message in e.email inbox: Your message could not be delivered for more than 4 hour(s)... delivery temporarily suspended: host mx03.t-online.de[194.25.134.73] refused to talk to me: 554
Maybe because of differing domains? (Server: mail.ecloud.global, address e.email)
How can these problems be solved?