[vps-mail] Multiple domain on VPS - rDNS for mail doesn't match mail server

[Marjolein Katsma <tfyj8lv02@xxxxxxxxxxxxxx>]

Yesterday, DNS for my domains, as well as that for my (reseller) hosting 
service, was down for a considerable time. Investigating why I could not 
reach anything nor send or receive email, I found that all these DNS 
servers (for my domains as well as my host's) are in the same netblock, and 
thus probably in the same location (pings to all of them timed out).

I found this confirmed using this URL 
http://www.dnsreport.com/tools/dnsreport.ch?domain=hshelp.com and the 
variant of it for my host's domain.

Now (since last night) it's up again, so I rechecked the DNSreport data - 
and found several warnings in addition to the (expected) warning about the 
DNS servers. The one that worries me most is this:

~~~~~
WARN	Mail server host name in greeting	WARNING: One or more of your
mailservers may be claiming to be a host other than what it really is
(the SMTP greeting should be a 3-digit code, followed by a space or a
dash, then the host name). This probably won't cause any harm, but may
be a technical violation of RFC821 4.3.

hshelp.com claims to be host javawoman.com.
~~~~~

The server actually services three domains; main domain javawoman.com, with 
two more, all serviced by the
same email server (sendmail) at the same IP address (additional domains set 
up as virtual domains in sendmail config).

Is there some way I can adapt the sendmail configuration so that for each 
of the domains it reports the correct mail server host name? Or something 
else I can do to correct this?

Other helpful folks sugested adapting the DNS data, but I don't think I can 
do this myself.

Any suggestions welcome - for obvious reasons I don't like to be violating 
any RFCs.


--
Marjolein Katsma

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