IDLE not working for one account only

[Geoff Winkless]

On Tue, 5 Jun 2018 at 12:14, Neil Price <nprice at gibb.co.za> wrote:
>
> On 05/06/2018 12:19, Geoff Winkless wrote:
> > On Tue, 5 Jun 2018 at 08:17, Neil Price <nprice at gibb.co.za> wrote:
> >> I can not see anything the account setup that can cause this, suggestions?
> > Running behind an overly-aggressive TCP proxy?
> There is no proxy involved. They are all on the same physical network.
> > What does tcpdump/wireshark show?
> >
> What am I looking for? The only thing I see which is relevant after a
> mail has been sent is

[snip]

Mmmf.

As a bit of a Hail Mary, try disabling TCP offloading on the client
machine's network card.

Geoff