Understanding multiple Virtual SMTP Servers

1) Other than hosting multiple domains, what other reasons are there to run more than one Virtual SMTP server?

2) This is the bigger question - A client recently acquired another *small* business with its own domain.  Their solution was to add the acquired domain under Recipient Policies in the Exchange System Manager and then add those few new users in A/D - and it worked well for them.  But why shouldn't they have set up a new Virtual SMTP server for the new company?  I'm trying to understand the difference between running multiple SMTP servers and just plugging multiple domains into Recipient Policies.

Thanks for any help you can offer.
james_axtonAsked:
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mass2612Connect With a Mentor Commented:
In the real world you generally won't see people with multiple vsmtp servers. However you may have occasions where you have different smart hosts or mx records pointing to different IP's. I would generally dicourage creating multiples as you don't get a performance benefit for most situations and just make supporting the system more complex.
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mass2612Commented:
Hi,

Using mulitple virtual SMTP servers is not very common. The default VSMTP server is normally sufficient for most situations. You would usually only use multiple virutal SMTP server in a dual homed situation or where you needed to have different ports/IP addresses for different SMTP domains or different policies for filtering, blocking, etc.


http://technet.microsoft.com/en-us/library/aa997301(EXCHG.65).aspx

http://msexchangeteam.com/archive/2005/01/24/359677.aspx
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Malli BoppeConnect With a Mentor Commented:
Single SMTP virtual server should be able handle traffic for multiple domains.Creating multiple Virtual SMTP for each domain doesn't increase any performance but just adds complexity.
http://msexchangeteam.com/archive/2005/02/25/380481.aspx 
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james_axtonAuthor Commented:
mass2612, the "different ports" aspect I understand, but can you give me a "real world" example of why I would need to use multiple VSMTP servers when trying to accommodate "dual homed" or "different IP address" scenarios?  Thanks!
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james_axtonAuthor Commented:
Thanks for the follow-up.  I bumped the points up and will split them.  
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