On Tue, Sep 14, 2021 at 08:24:00AM +0100, Nick Howitt
wrote:
> On 14/09/2021 04:29, raf wrote:
> >
> > On Tue, Sep 14, 2021 at 01:20:03PM +1000, raf wrote:
> >
>
> >
> > But chances are that mail clients just do what any
> > other TCP client would do. That might be why you can't
> > find an
> when a user clicks "send", the email client has to make some tcp-connection
> to some ip address.
> what if the hostname configured at the email client resolves to multiple ip
> addresses?
There are several hops that could randomize ips:
- authoritative dns server
- dns resolver at your di
If you are only
interested in what mail clients do, and can't find any
online explanation, you could either look at the source
code to some open source ones (probably the easiest
way),
to me, this feels rather the most troublesome way :-)
or set up a mail smarthost with multiple IP
address
On 14/09/2021 04:29, raf wrote:
On Tue, Sep 14, 2021 at 01:20:03PM +1000, raf wrote:
But chances are that mail clients just do what any
other TCP client would do. That might be why you can't
find any discussion on the topic. Remember, the only IP
address(es) that the mail client will be co
On Tue, Sep 14, 2021 at 01:20:03PM +1000, raf wrote:
> On Mon, Sep 13, 2021 at 11:07:27AM +0200, Max-Julian Pogner
> wrote:
>
> > Hi there,
> >
> > when a user clicks "send", the email client has to make some tcp-connection
> > to some ip address.
> > what if the hostname configured at the em
On Mon, Sep 13, 2021 at 11:07:27AM +0200, Max-Julian Pogner
wrote:
> Hi there,
>
> when a user clicks "send", the email client has to make some tcp-connection
> to some ip address.
> what if the hostname configured at the email client resolves to multiple ip
> addresses?
>
> i actually know th
On Mon, Sep 13, 2021 at 07:58:26AM -0400, Wietse Venema wrote:
> > When a user clicks "send", the email client has to make some
> > tcp-connection to some ip address. What if the hostname configured
> > at the email client resolves to multiple ip addresses?
>
> It just seems unlikely that major
Max-Julian Pogner:
> Hi there,
>
> when a user clicks "send", the email client has to make some
> tcp-connection to some ip address.
> what if the hostname configured at the email client resolves to multiple
> ip addresses?
It just seems unlikely that major email service providers would run
all
I would hazard a guess that the client connects to the first IP from the
RRset his cashing DNS resolver gives him (since mail clients AFAIK do
not have in-built DNS resolver functionality. How is the resource record
set ordered depends on setting on the server, usually (though the DNS
client co
Hi there,
when a user clicks "send", the email client has to make some
tcp-connection to some ip address.
what if the hostname configured at the email client resolves to multiple
ip addresses?
i actually know the theory (either round-robin, or just the first, or
try first and if fail then tr
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