Message could not be sent error

Thank you,
My provider requires 465 as well, but when i enter 587 and leave SSL unchecked, there is another error message saying: failed recipients (see screenshot)

@lubos
Does Manager use java? Because of an issue with another software package i downgraded the jre package to version 8 (from the default in ubuntu 18.04 which is version 11).

Now i can send mail again without issues.
Don’t know if this was the cause of the issue, but it might have been in my case.

On Linux, Manager is using Mono. Not Java. But it’s possible upgrading Java could have broken your Ubuntu in some way which Mono depends on.

Tried it on another PC with ubuntu 18.04. The downgrade workaround does not work in this situation. So there must be something else…
Anyway i can send from 1 pc so that is sufficient for me.

@lubos
I updated the pc which worked (version 19.2.57) to latest 19.2.68 which is also on the pc that did not work.

Now the pc which worked before does not work anymore either. Can i download version 19.2.57 somewhere so i can try again?

The version 19.2.57 for Ubuntu is at:

https://d2ap5zrlkavzl7.cloudfront.net/19.2.57/Manager.deb

However, I can assure you it will make no difference. There is something outside of Manager blocking your emails. Emails stopping to work after the upgrade must be a coincidence.

Unfortunately you are right, downgrading does not solve this.

@lubos
Any idea where and how to start debugging this issue?

I will try to reproduce this issue on fresh Ubuntu 18.04 and will let you know.

Thanks, I use Linux mint which is based on 18.04, but there are differences.

That’s fine. I will test with Linux Mint too.

I’m able to reproduce the issue. If you run the following command:

mozroots --import --ask-remove

It will fix your problem.

It does indeed!!
Thanks a lot for the help.