Postman sending out multiple mail (Until timeout!)

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Hi, I just had a problem on a live site that sended out 2000 email (untill it hit a hard limit).

Tested this problem on a testserver:
– Sending confirmation woo-commerce email with default wordpress: Just one mail
– Sending confirmation woo-commerce email with Postman SMTPJust: Unstopable flood of email. 🙂

It did not matter if Postman was sending through local or remote SMTP. Now tested it again with SMTP4DEV: same problem.

Somehow because of Postman the source keeps sending the same email over and over. (or maybe postman is sending out copies?)

Any information on how to fix this or look into it where the problem could arise.

Note: I found out the same error occurs when using a resend notifications from Gravity Forms