On 2016-01-22 08:49, Per Jessen wrote:
Sounds like it might be greylisting.
But hidden? I thought that it could be a content filter, because a retry from thunderbird on the same account fails, several times. To retry, I have to copy the "sent" mail to the "draft" folder, click edit that email, and then click send. This means that the messageid changes, I believe.
So, it is thus a bug in Thunderbird that doesn't catch the situation properly.
At least it is easily reproduced then. You can make your postfix reply 451 to everything.
On my permanent setups I do use postfix, and there it is not a problem. Postfix catches those temporary problems and automatically retries later. I can forget them. The problem are my temporary setups, like the test partition in my laptop for Leap, which being only 8 GB, I minimize what I do. There I send directly from Thunderbird, without using postfix, being a bit more complex to setup. -- Cheers / Saludos, Carlos E. R. (from 13.1 x86_64 "Bottle" at Telcontar)