Type: Bug

Component:
SES

Describe the bug
It seems that the SimpleEmailServiceJavaMailSender.send(MimeMessagePreparator...) method creates a single MimeMessage instead of creating an array of MimeMessages.
In fact, it creates a single MimeMessage and invokes the preparators on the same instance. Then, it invokes send(MimeMessage) with the single message.

The correct behaviour, according to JavaMailSender interface's default implementation for the same method, is to create an array of MimeMessage and call send(MimeMessage...)