You have introduced a compatibility bug with a popular Mailer plugin Post SMTP Mailer/Email Log in your latest v4.1.5 release.
If you update to v4.1.5, the mailer stops working & complains that the
wp_mail()function has already been declared:
Postman: wp_mail has been declared by another plugin or theme, so you won’t be able to use Postman until the conflict is resolved.
This is the full error notice:
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