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Re^4: Determine if domain is actually used for email

by Limbic~Region (Chancellor)
on Oct 04, 2011 at 19:17 UTC ( #929646=note: print w/replies, xml ) Need Help??


in reply to Re^3: Determine if domain is actually used for email
in thread Determine if domain is actually used for email

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

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Re^5: Determine if domain is actually used for email
by Your Mother (Chancellor) on Oct 04, 2011 at 19:35 UTC

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

      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.

      So am I right that, although not 100% reliable, this might be a good way to check if a domain has an actual email with no risk to be caught as spammer? Is there a code which implements this approach?

        Depends how many servers you are looking at and how good the IDS is on the site. If it was enough of a problem, I could see using that fingerprint to tag a site to watch behavior more closely. ISTR discussions about this many years ago on SPAM-L. Perhaps browsing the archives for doorknocking, testing addresses, and some similar search terms might be useful.

        --MidLifeXis

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[Eily]: Maybe the puns in his dialogues were somehow kept through translation, but I can tell he lost his accent
[LanX]: qui?
[Eily]: Astérix
1nickt gives up on finding a Perl YAML parser that supports hash merging. In 2017.
[LanX]: Oh yes true, he lost his accent! xD
[Eily]: and since his name is a modified version of astérisque (asterisk), which is a typographical symbol, I think it's even funnier that he would lose a diacritic
[Eily]: the pun doesn't work so well with "he lost a diacritic" though :P
[LanX]: Obelix might offer to find it again ...
[LanX]: not much to translate anyway since Goscinny died
[Eily]: https://en. wikipedia.org/ wiki/List_of_Aster ix_characters some of the names were changed to include a new pun

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