Change record status: 
Project: 
Introduced in branch: 
11.4.x
Introduced in version: 
11.4.0
Description: 

Previously if an email address with a deprecated format was validated by a form the address would pass validation. But mail transfer will usually fail with a warning because servers do not support it. This included addresses with a space character between the local part (username) and '@' symbol, for example "john.doe @example.com".

The EmailValidator class has been updated to cause deprecated format addresses to fail validation instead.

Impacts: 
Site builders, administrators, editors
Module developers
Site templates, recipes and distribution developers