I have Postman working perfectly with GMAIL on a WordPress (latest) site that contains the Jupiter theme. Both standard theme form are emailing perfectly. Postman tests OK from its settings panel.
I then installed Conact Form 7 as there is a requirement for more complex data collection from users and it will not work no matter what. I get the infamous message “Failed to send your message. Please try later or contact the administrator by another method.” with the orange border.
I have disabled all but CF7 & Postman, same problem.
I have have made sure the from and to emails in the form email set up are the correct GMAIL account. Still the same error.
Again, sending a test from Postman settings works perfectly.
Most of the info I found points to ensuring the OAuth process in set up is done correctly (which I did and this is why the test email and standard template forms work well), and also making sure the from email is correct (which I can confirm too).
Lastly, I have emptied the log in Postman and upon re-trying to send via CF7, nothing is added to the log as an entry.
Any suggestions appreciated.