In November 2016 we became aware that Adobe ColdFusion 2016 and earlier versions have issues with sending emails to IDN domains. Something that is possible for a very long time and becomes more and more common - at least in countries like Germany that have special chars. The CFMAIL errors with
The value of the attribute to, which is currently foo@bäüöß.com, is invalid.
coldfusion.tagext.InvalidTagAttributeException: Attribute validation error for tag CFMAIL. at coldfusion.tagext.net.MailTag.validate(MailTag.java:743) at coldfusion.tagext.net.MailTag.processAttributes(MailTag.java:846)
and compared to this failure the validation with
says the email address is valid.