Re: [exim] Delivering Mail to Yahoo user

On Mon, Dec 21, 2015 at 01:31:03PM +0100, Marc Haber wrote:
> On Mon, 21 Dec 2015 15:04:23 +0300, Odhiambo Washington
> <odhiambo@???> wrote:
> >2015-12-21 10:24:17 1a9cA9-0005Hu-3s == johnowino2000@???
> >R=outbound_throttled T=throttled_smtp defer (-18) H=mx-eu.mail.a
> >m0.yahoodns.net [188.125.69.79]: Remote host closed connection in response
> >to end of data
>
> Yahoo - a service provider too big to care for standards - is dropping
> your connection at a place where it should not do that without telling
> you why.

IMHO, posted logs show indications of broken Path MTU Discovery.
Traffic dump between client and Yahoo relay may clarify this issue.
--
Eugene Berdnikov