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Reminder to self: check if @NS_online finally accepts email addresses having a plus sign in them

Posted by jpluimers on 2021/05/12

Quite a while back, @NS_Online (Dutch railroads) did not accept plus signs in email addresses. I verified a few times over the years and not much progress.

This is a reminder to myself to re-check.

Below the fold the Twitter thread that started with [WayBack] Jeroen Pluimers on Twitter: “Toch jammer dat @NS_online valide email adressen met een plus-teken erin weigert.… “

Hopefully by now they retraced themselves from the bad company of many other parties failing to adhere to clear and long existing internet standards: [WayBack] User:Me at work/plushaters | Mozilla Community | FANDOM powered by Wikia.

Their web care team and their developers made a assumptions there:

  • questioning the use of a + in email addresses
  • questioning the email address used
  • diminishing the popularity of using a + inside email addresses
  • when you never heard of something, it does not exist
  • you can validate an email address without actually trying to deliver it

Some links on email addresses and their validity:

A bit takeaway:

  • when doing server side validation using XHR (XMLHttpRequest – Wikipedia), then be aware that you need to encode strings properly so you do not loose information


  1. Toch jammer dat valide email adressen met een plus-teken erin weigert.

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