Question

what is luminescent ???

Answer 1

Luminescence is emission of light by a substance not resulting from heat; it is thus a form of cold-body radiation. It can be caused by chemical reactions, electrical energy, subatomic motions or stress on a crystal, which all are ultimately caused by Spontaneous emission.

Answer 2

Lumen provides a clean, simple API over the popular SwiftMailer library with drivers for SMTP, Mailgun, SparkPost, Amazon SES, PHP's mail function, and sendmail , allowing you to quickly get started sending mail through a local or cloud based service of your choice.