placeholders (curly brackets) in Email not expanded for domains containing upper case letters

[TerraD]

If a customer registers using upper and lower case characters in the domain name of the email-address (in my case abcd@iXXtra.ch) the placeholders in the email will not expand. The registration Email will look like this (from a shop in switzerland):

Hallo {firstname} {lastname}, Vielen Dank für die Eröffnung Ihres Kundenkontos bei {shop_name}

Ihre Anmeldedaten für {shop_name} Hier sind Ihre Anmeldedaten: E-Mail-Adresse: {email}

...

All subsequent Emails will have the same problem. The registration process runs fine, the user may log in, orders can be made...

As upper case is allowed in domain names (iXXtra.ch and ixxtra.ch are the same thing)I consider this to be a bug

Edited June 25, 2019 by TerraD (see edit history)

[Gneston]

We detected the same error, but only on Linux Servers.

Uppercase letters in e-mail domain -> no filled placeholders.

 

Adding the following line to classes/Mail.php in "function send" seems to fix this error.

$to = mb_strtolower($to);

But it is only a quick & dirty fix, so please provide a better fix that catches the real bug.