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@Jean-Paul
The line 318 of MailSender is currently:
msg.setFrom(Mailer.StringToAddress(Mailer.descriptor().getAdminAddress(), charset));
See:
https://github.com/jenkinsci/mailer-plugin/blob/master/src/main/java/hudson/tasks/MailSender.java#L318
I think that you have an empty email address for Admin.
Can you check in your global Jenkins configuration at "Jenkins location", if your "System Admin e-mail address" is empty or starts with a space for example?
In which case, this issue would be that the exception message could really be improved to explain what is the cause.