[ On Saturday, March 15, 2003 at 11:07:19 (+0100), Florian Weimer wrote: ]
> Subject: Re: [Exim] Reaction to rude 554 greeting
>
> Some people use the 554 greeting to indicate "no mail under this
> domain", some to say "please try the next MX".
Those who think the latter have not properly interpreted the RFCs.
Any 5xx response is always a _permanent_ failure, even if it is given
instead of a 220 greeting response.
A 5xx response to a connection attempt simply means fail the current
delivery attempt (i.e. bounce just the one message from the queue).
Nothing more, and certainly nothing less. Do not pass go, do not
collect $200, and definitely do not go on to any other MX host!
However it also does _not_ mean "do not ever deliver any e-mail to this
host", though it does mean "do not attempt another delivery to this host
until at least 30 minutes have passed". Even "permanent" errors can be
transient errors.
--
Greg A. Woods
+1 416 218-0098; <g.a.woods@???>; <woods@???>
Planix, Inc. <woods@???>; VE3TCP; Secrets of the Weird <woods@???>
