Hello, my problem is that Quform suddenly stopped sending emails to my email address about 4 weeks ago. I have not changed anything in the system for months. The customer always receives his email without any problems. Changing my own email address does not change anything. I have already switched back from Quform 2.20 to 2.19 and 2.17, but this did not bring any change either.
I have now installed Post SMT, and here the system reports “Transaction failed Unauthorized sender address.” when sending. But only for my own addresses.
A test with another tool (WpForms) runs without any problems, so the problem can only be with the Quform plugin itself.
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