Bristol Digest, Vol 635, Issue 1

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Today's Topics:

1. DNS oddities (Martin Moore)
2. Re: DNS oddities (Amias Channer)
3. Re: DNS oddities (nick robinson)


----------------------------------------------------------------------

Message: 1
Date: Fri, 04 Mar 2016 10:47:15 +0000
From: Martin Moore <martinm@it-helps.co.uk>
To: <bristol@mailman.lug.org.uk>
Subject: [bristol] DNS oddities
Message-ID: <9F94BFB9-47DD-459E-9506-426E28098658@it-helps.co.uk>
Content-Type: text/plain; charset="UTF-8"

I recently moved our email from self hosted (Debian) to Google (6 days ago).

However, I?m still getting a few emails per day to the original self-hosted mailboxes as well as Google. DNS (hosted by dnsmadeeasy) only has the Google MX records in.

Some (but not all) are from our own servers ? stuff like nagios alerts. Is there any config that needs to change on our servers to prevent ?internal? emails getting incorrectly routed? DNS is probably still running on our own servers even though it?s not used. I guess that could well explain the internal mail issues?

Surely the DNS must have propagated everywhere by now?
I?m a bit baffled ? any ideas?


Ta,

Martin.







------------------------------

Message: 2
Date: Fri, 4 Mar 2016 10:58:11 +0000
From: Amias Channer <me@amias.net>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] DNS oddities
Message-ID:
<CAMgU7XV8XpS+FYGKTU96uEGQM56mH5wWaPoTLZxb7_V9ei=B4A@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

Hello Martin,

You could check this by ssh'ing to the box in question and running dig
or nslookup.

dig mx domainname.com

will show you what DNS gives your box for that domain

if that doesn't seem to make sense then maybe you have something in /etc/hosts

also check /etc/resolv.conf to see what nameservers your box is using.

Without knowing what email server you where running i can't suggest a
solution but
if it is not longer the destination for mail for that domain then it
will need to be told so.
Just changing DNS records won't do this.

Cheers
Amias

On 4 March 2016 at 10:47, Martin Moore <martinm@it-helps.co.uk> wrote:
> I recently moved our email from self hosted (Debian) to Google (6 days ago).
>
> However, I?m still getting a few emails per day to the original self-hosted mailboxes as well as Google. DNS (hosted by dnsmadeeasy) only has the Google MX records in.
>
> Some (but not all) are from our own servers ? stuff like nagios alerts. Is there any config that needs to change on our servers to prevent ?internal? emails getting incorrectly routed? DNS is probably still running on our own servers even though it?s not used. I guess that could well explain the internal mail issues?
>
> Surely the DNS must have propagated everywhere by now?
> I?m a bit baffled ? any ideas?
>
>
> Ta,
>
> Martin.
>
>
>
>
>
> _______________________________________________
> Bristol mailing list
> Bristol@mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bristol



------------------------------

Message: 3
Date: Fri, 4 Mar 2016 11:32:17 +0000
From: nick robinson <nick@njrobinson.net>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] DNS oddities
Message-ID:
<CADo8qK5rqemoyvBz2KM1tSqh4m_eonicR5uSKxRv5v4t4CucRA@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Some smtp servers (and even network switches) will cache the dns result
beyond what they should do.
If your DNS is set up correctly turn off your old mail server and force any
new mail to recheck the settings.

On 4 March 2016 at 10:47, Martin Moore <martinm@it-helps.co.uk> wrote:

> I recently moved our email from self hosted (Debian) to Google (6 days
> ago).
>
> However, I?m still getting a few emails per day to the original
> self-hosted mailboxes as well as Google. DNS (hosted by dnsmadeeasy) only
> has the Google MX records in.
>
> Some (but not all) are from our own servers ? stuff like nagios alerts. Is
> there any config that needs to change on our servers to prevent ?internal?
> emails getting incorrectly routed? DNS is probably still running on our own
> servers even though it?s not used. I guess that could well explain the
> internal mail issues?
>
> Surely the DNS must have propagated everywhere by now?
> I?m a bit baffled ? any ideas?
>
>
> Ta,
>
> Martin.
>
>
>
>
>
> _______________________________________________
> Bristol mailing list
> Bristol@mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bristol
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