- 🇳🇿New Zealand quietone
email validation is handled by Egulias, added in #2313669: Bring in egulias/EmailValidator for RFC compliant email address validation → which include this.
I am suggesting using the following code to add further restriction that the e-mail needs to have a valid corresponding mail exchange record. The use of function_exists is primarily targeted towards Windows installations. This can be further enhanced by adding a variable_get call to enable/disable this new functionality from the admin menu.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
email validation is handled by Egulias, added in #2313669: Bring in egulias/EmailValidator for RFC compliant email address validation → which include this.