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Re^2: Determine if domain is actually used for email

by Limbic~Region (Chancellor)
on Oct 04, 2011 at 18:19 UTC ( #929630=note: print w/replies, xml ) Need Help??

in reply to Re: Determine if domain is actually used for email
in thread Determine if domain is actually used for email

Your Mother,
Except that vit indicated in the original post that the presence of an MX record is not a reliable source of the domain's ability to receive email. Apparently DNS administrators are registering MX records all willy nilly.

Cheers - L~R

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Re^3: Determine if domain is actually used for email
by Your Mother (Chancellor) on Oct 04, 2011 at 19:14 UTC

    Sure... but unless I'm misled, with UDP there simply is no way to know for sure excepting an out of band response—a visit to a tokenized URI sent in a message or a return message from the same domain/address. So no checks will be guaranteed. "Heroic" messages to circumvent misused standards / client-fail seems a mistake.

      Your Mother,
      I have no idea where UDP came into the conversation since SMTP is a TCP protocol. I agree that there is no way to be sure unless you can deliver mail to a recipient and get a DSN or, preferred, a response. Seeing if the server is listening on port 25 and is responding in a manner consistent with a SMTP server and not giving a 521 status code is a pretty safe bet though.

      Cheers - L~R

        Good to know. Thanks. "Safe bet" still sounds like gambling. :P

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[hippo]: Congrats. I expect the resulting code to be rock solid. :)
[stevieb]: Thanks hippo, as do I, as if it's not, hardware peripherals or sensors could be destroyed (code has to be reliable when dealing with input/output voltages)

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