I want to learn which one is a better way to setup mx records.

For ex we have are a isp.com firm.We serv "a.com" "b.com" "c.net" etc
lots of domains.
Is it better to setup mx.a.com 5.5.5.10 ,mx.b.com 5.5.5.10 ,mx.c.net
5.5.5.10 records for each domain or setup
mx.isp.com 5.5.5.10 record to all domains ?

The second one seems easier dns and mail administration(lika active/
passive mail server backup issues) but it has got disadvantages?Like
spam problems etc?

(E-Mail Removed) wrote:
> I want to learn which one is a better way to setup mx records.
>
> For ex we have are a isp.com firm.We serv "a.com" "b.com" "c.net" etc
> lots of domains.
> Is it better to setup mx.a.com 5.5.5.10 ,mx.b.com 5.5.5.10 ,mx.c.net
> 5.5.5.10 records for each domain or setup
> mx.isp.com 5.5.5.10 record to all domains ?

Your post is kind of confusing but I think I get the point, the MX record is
supposed to give the mail server's HELO name regardless of the domain it
servers.

a.com MX 10 mail.isp.com

b.com MX 10 mail.isp.com

c.com MX 10 mail.isp.com

mail.isp.com A <IPAddress>


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Thanks,
>> the MX record is supposed to give the mail server's HELO name regardless of the domain it
Yes it's ok and below are the same but which one is better?

> a.com MX 10 mail.a.com
>
> b.com MX 10 mail.b.com
>
> c.com MX 10 mail.c.com

mail.a.com A 5.5.5.10
mail.b.com A 5.5.5.10
mail.c.com A 5.5.5.10

##########

> a.com MX 10 mail.isp.com
>
> b.com MX 10 mail.isp.com
>
> c.com MX 10 mail.isp.com
>
> mail.isp.com A 5.5.5.10


>
> Your post is kind of confusing but I think I get the point, the MX record is
> supposed to give the mail server's HELO name regardless of the domain it
> servers.
>
> a.com MX 10 mail.isp.com
>
> b.com MX 10 mail.isp.com
>
> c.com MX 10 mail.isp.com
>
> mail.isp.com A <IPAddress>
>
> --
> Best regards,
> Kevin D. Goodknecht Sr. [MVP]
> Hope This Helps
> Send IM:http://www.icq.com/people/webmsg.php?to=296095728
> ===================================
> When responding to posts, please "Reply to Group"
> via your newsreader so that others may learn and
> benefit from your issue, to respond directly to
> me remove the nospam. from my email address.
> ===================================http://www.lonestaramerica.com/http://support.wftx.us/http://message.wftx.us/
> ===================================
> Use Outlook Express?... Get OE_Quotefix:
> It will strip signature out and morehttp://home.in.tum.de/~jain/software/oe-quotefix/
> ===================================
> Keep a back up of your OE settings and folders
> with OEBackup:http://www.oehelp.com/OEBackup/Default.aspx
> ===================================

(E-Mail Removed) wrote:
> Thanks,
>>> the MX record is supposed to give the mail server's HELO name
>>> regardless of the domain it
> Yes it's ok and below are the same but which one is better?
>
>> a.com MX 10 mail.a.com
>>
>> b.com MX 10 mail.b.com
>>
>> c.com MX 10 mail.c.com
>
> mail.a.com A 5.5.5.10
> mail.b.com A 5.5.5.10
> mail.c.com A 5.5.5.10

This is not recommended unless the mail server can answer with multiple HELO
names.

Here the test:
telnet 5.5.5.10 25

If it answers:
220 mail.a.com ESMTP Service ready

All MX records in any hosted domain, should give out the MX record that says
the mail server is mail.a.com.

When you connect to the server's IP on port 25 using the command above the
mail server will answer with its HELO name

It is highly recommended that you use the HELO name in the MX record, and
that 5.5.5.10 reverses to this.

10.5.5.5.in-addr.arpa. PTR mail.a.com

I don't know of any SMTP servers that will answer with more than one HELO
name on one IP.

You can have several SMTP virtual servers with different IP addresses, on
the same mail server, each giving its own HELO name. But, it won't work in
your case because all domains are using the same mail server. Therefore all
MX records must give the same mail server name.

--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This Helps
Send IM: http://www.icq.com/people/webmsg.php?to=296095728
===================================
When responding to posts, please "Reply to Group"
via your newsreader so that others may learn and
benefit from your issue, to respond directly to
me remove the nospam. from my email address.
===================================
http://www.lonestaramerica.com/
http://support.wftx.us/
http://message.wftx.us/
===================================
Use Outlook Express?... Get OE_Quotefix:
It will strip signature out and more
http://home.in.tum.de/~jain/software/oe-quotefix/
===================================
Keep a back up of your OE settings and folders
with OEBackup:
http://www.oehelp.com/OEBackup/Default.aspx
===================================

<(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>
> Thanks,
>>> the MX record is supposed to give the mail server's HELO name
>>> regardless of the domain it
> Yes it's ok and below are the same but which one is better?
>
>> a.com MX 10 mail.a.com
>> b.com MX 10 mail.b.com
>> c.com MX 10 mail.c.com

OR

>> a.com MX 10 mail.isp.com
>> b.com MX 10 mail.isp.com
>> c.com MX 10 mail.isp.com

The First is almost never possible since the SMTP servers (almost?)
always only use ONE HELO name and the MX really needs to match
that.

Also it is best that this name be the one which is returned from a
reverse lookup (the PTR record for the address) so that can only
be ONE name also.

Use the second.

--
Herb Martin, MCSE, MVP
http://www.LearnQuick.Com
(phone on web site)