Thanks,
Yes it's ok and below are the same but which one is better?
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
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