On Mon, Sep 18, 2023 at 04:42:39PM -0400, Mike Bianchi via Postfix-users wrote:
> Thunderbird works with *.mail.pairserver.com connections, inbound and
> outbound.
You almost certainly have authentication configured in Thunderbird, by
configuring a suitable account name and password.
> ...
Looks like a normal reject of a consumer based endpoint (IP address).
Pretty common, most major services will reject email from such addressess.
When you're using Thunderbird you're most likely authenticating before
sending which is not the case with Postfix.
On Mon, Sep 18, 2023 at 4:43 PM Mike
