>going to be one of your many worries.
It's not residental service, we're talking business service via DSL/cable.
I heard on one mailing list that rr, at least, is currently re-doing its PTR, so that IP businees clients will have PTR domains under biz.rr.com.
dynamic/resdenital clients will be under another domain, such as
res.rr.com.
This is exactly how AOL, truly an industry infrastruture technical leader/example for mail and DNS, did their PTRs years ago. Their subscriber IPs are under
ipt.aol.com
... which simplifies blocking by PTR.
There are all sorts of reasons as to why small businesses might need to run their own mail server, but see no need to spend several times the $$$ for a T1 line as opposed to DSL or cable.
1. as long as the client accepts their is not contractual SLA, why not?
2. they will have to live side-by-side under the PTR domain with infected, abusive direct-to-MX machines. Not their fault. They should complain to their provider to clean up the providers networks, or risk losing their business.
Many of the businesses we work with have their own internal Exchange servers for reason of collaboration needs, or integration with other internal processes.
relay through the provider's MTA outbound gateway. The provider may, perhaps later, be FORCING that by blocking egress to port 25.
Len
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