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Re: testing email deliverability...

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From Arno Welzel <usenet@arnowelzel.de>
Newsgroups comp.os.linux.misc, comp.lang.php
Subject Re: testing email deliverability...
Date Fri, 06 Jun 2014 14:11:41 +0200
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Cross-posted to 2 groups.

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Am 2014-06-05 02:48, schrieb The Natural Philosopher:

> I have web contact pages which are used by anyone to send enquiries.
> 
> I want to make sure that anyone using them has a valid reply address set 
> in a web form BEFORE I forward the message on to the site administrators.

Without asking the MX you will never know, if the MX is willing to
accept the mail.

And even then - temporary 4xx-failures due to Greylisting are a valid
behaviour as well as failures due to a quota limitation etc. - which all
does *not* mean that the e-mail address is invalid. Unfortunately the
opposite behaviour - accepting a RCPT TO without any error in return -
must not be interpreted as "this is a valid address".

Therefore the usual way to handle this is to send an e-email with a
confirmation request so the user can approve that himself - combined
with a database table to store the pending approvals (which should
timeout after a certain time if no one approves the request - e.g. after
7 days).


-- 
Arno Welzel
http://arnowelzel.de
http://de-rec-fahrrad.de
http://fahrradzukunft.de

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Thread

testing email deliverability... The Natural Philosopher <tnp@invalid.invalid> - 2014-06-05 01:48 +0100
  Re: testing email deliverability... Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2014-06-04 18:40 -0700
    Re: testing email deliverability... Denis McMahon <denismfmcmahon@gmail.com> - 2014-06-05 02:05 +0000
      Re: testing email deliverability... Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2014-06-04 19:17 -0700
    Re: testing email deliverability... Rahul <nospam@invalid.invalid> - 2014-06-05 07:11 +0000
    Re: testing email deliverability... Rahul <nospam@invalid.invalid> - 2014-06-05 11:08 +0000
      Re: testing email deliverability... Marc Haber <mh+usenetspam1118@zugschl.us> - 2014-06-14 11:53 +0200
        Re: testing email deliverability... Rahul <nospam@invalid.invalid> - 2014-06-14 18:34 +0000
          Re: testing email deliverability... Marc Haber <mh+usenetspam1118@zugschl.us> - 2014-06-15 08:54 +0200
  Re: testing email deliverability... "Tony Marston" <TonyMarston@hotmail.com> - 2014-06-05 03:47 +0100
    Re: testing email deliverability... Eli the Bearded <*@eli.users.panix.com> - 2014-06-05 04:53 +0000
      Re: testing email deliverability... Richard Kettlewell <rjk@greenend.org.uk> - 2014-06-05 09:13 +0100
        Re: testing email deliverability... Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2014-06-05 08:05 -0700
          Re: testing email deliverability... The Natural Philosopher <tnp@invalid.invalid> - 2014-06-05 16:21 +0100
          Re: testing email deliverability... Jerry Stuckle <jstucklex@attglobal.net> - 2014-06-05 11:27 -0400
          Re: testing email deliverability... Mike McGinn <mikemcginn@mcginnweb.net> - 2014-06-05 16:31 +0000
            Re: testing email deliverability... "Peter J. Holzer" <hjp-usenet3@hjp.at> - 2014-06-05 21:15 +0200
      Re: testing email deliverability... Arno Welzel <usenet@arnowelzel.de> - 2014-06-09 11:30 +0200
        Re: testing email deliverability... Eli the Bearded <*@eli.users.panix.com> - 2014-06-09 23:08 +0000
          Re: testing email deliverability... Arno Welzel <usenet@arnowelzel.de> - 2014-06-10 11:08 +0200
  Re: testing email deliverability... Sam <sam@email-scan.com> - 2014-06-04 22:04 -0500
    Re: testing email deliverability... Jerry Stuckle <jstucklex@attglobal.net> - 2014-06-04 23:27 -0400
    Re: testing email deliverability... The Natural Philosopher <tnp@invalid.invalid> - 2014-06-05 05:37 +0100
      Re: testing email deliverability... Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2014-06-04 21:55 -0700
        Re: testing email deliverability... The Natural Philosopher <tnp@invalid.invalid> - 2014-06-05 06:17 +0100
      Re: testing email deliverability... Chuck Anderson <cycletourist@invalid.invalid> - 2014-06-05 21:36 -0600
        Re: testing email deliverability... Jerry Stuckle <jstucklex@attglobal.net> - 2014-06-06 09:41 -0400
          Re: testing email deliverability... Denis McMahon <denismfmcmahon@gmail.com> - 2014-06-06 14:37 +0000
            Re: testing email deliverability... The Natural Philosopher <tnp@invalid.invalid> - 2014-06-06 16:46 +0100
              Re: testing email deliverability... Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2014-06-06 10:39 -0700
                Re: testing email deliverability... Jerry Stuckle <jstucklex@attglobal.net> - 2014-06-06 14:22 -0400
                Re: testing email deliverability... The Natural Philosopher <tnp@invalid.invalid> - 2014-06-06 20:54 +0100
                Re: testing email deliverability... Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2014-06-06 13:22 -0700
                Re: testing email deliverability... Eli the Bearded <*@eli.users.panix.com> - 2014-06-06 21:55 +0000
                Re: testing email deliverability... Chris Davies <chris-usenet@roaima.co.uk> - 2014-06-09 13:56 +0100
                Re: testing email deliverability... Marc Haber <mh+usenetspam1118@zugschl.us> - 2014-06-14 11:55 +0200
  Re: testing email deliverability... Jerry Stuckle <jstucklex@attglobal.net> - 2014-06-04 23:05 -0400
  Re: testing email deliverability... "AvdB" <nomail@example.invalid> - 2014-06-05 12:59 +0200
    Re: testing email deliverability... The Natural Philosopher <tnp@invalid.invalid> - 2014-06-05 13:51 +0100
  Re: testing email deliverability... Adrienne Boswell <arbpen@yahoo.com> - 2014-06-05 18:39 +0000
    Re: testing email deliverability... Eli the Bearded <*@eli.users.panix.com> - 2014-06-05 20:46 +0000
      Re: testing email deliverability... Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2014-06-05 14:41 -0700
        Re: testing email deliverability... Eli the Bearded <*@eli.users.panix.com> - 2014-06-06 22:26 +0000
      Re: testing email deliverability... Adrienne Boswell <arbpen@yahoo.com> - 2014-06-05 22:21 +0000
  Re: testing email deliverability... James Moe <jimoeDESPAM@sohnen-moe.com> - 2014-06-05 13:14 -0700
  Re: testing email deliverability... Arno Welzel <usenet@arnowelzel.de> - 2014-06-06 14:11 +0200
  Re: testing email deliverability... Chris Davies <chris-usenet@roaima.co.uk> - 2014-06-09 13:53 +0100
  Re: testing email deliverability... don.schueler@gmail.com - 2014-07-18 03:45 -0700

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