Re: Sending IP address in SMTP server
- From: "Sanford Whiteman" <swhitemanlistens-software@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 21 Aug 2007 00:13:08 -0400
So there's no way to host two different domain names from the same
machine?
I wouldn't put it that way.
Multiple outbound VSs can have the same EHLO string and source IP, so
they will all pass the PTR-EHLO-A roundtrip test. This doesn't mean
that they have the same settings internally. In fact, it makes it
easier to hide a bunch of different processing "engines" behind the
same public IP and reduce your DNS/RDNS obligations.
IIS SMTP's ability to host multiple virtual servers is most useful for
creating different inbound and outbound mailroutes, or creating
multiple outbound, with different retry settings, size limits,
encryption/authentication requirements, event sink hooks, etc.
VSs are not, strictly speaking, sandboxed from one another; you can't
consistently confer security and/or obscurity and/or customer branding
by using two outbound VSs _with essentially identical settings_ other
than their default domain. You can, however, get greatly increased
performance by splitting inbound spools across multiple disk spindles,
etc., by the use of VSs. And the more you purpose-build your VSs --
for example for inbound, outbound, and authenticated-only traffic --
the more you gain in manageability.
You really should explain _why_ you came to use multiple VSs on this
machine. Do you have performance goals vis-a-vis segregation? Security
goals? Explicit or implicit SLAs for different types of traffic?
--Sandy
.
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- From: Sanford Whiteman
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