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Jon,Are you looking up the MX records and then validating the host names in that list?
Maybe I am mis-understanding what you're doing but MX is the only way to know for sure which servers are out there for a domain. Generally Frequently simply the domain name itself resolves correctly but mail.xyz.com would just be a guess. In sites I work on it's usually smtp1.xyz.com and smtp2.xyz.com and such.
- Larry Jon Paris wrote:
I am using a small PHP program to perform validation on e-mail domain names using gethostbyname. I found that some domains (e.g. xyz.com) gave false fails, so I adapted the program to also try mail.xxx.xxx. I'm still seeing failures on some addresses that are supposed to be good. Any ideas on what else to check? Reason I need this is that sometimes I have to operate using an ISP that rejects all recipients if any one of them fails a DNS lookup. They don't tell you _which_ one - so it can be a royal pain trying to isolate the problem address. Jon Paris Partner400 www.Partner400.com www.RPGWorld.com
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