Problem solved by adding [*.]contacts.google.com to the exceptions list. Email mailing lists now work with Gmail in Opera. Hoooray!
Posts made by dangrunloh
RE: Gmail compose new message does not recognize labelsOpera for Windows
Gmail compose new message does not recognize labelsOpera for Windows
Gmail in Opera does not recognize group labels in Google contacts so email can be sent to multiple recipients with a single recipient name. I have tried adding [*.]gmail.google.com to the exceptions list. Works fine in Firefox. Love Opera for Android. Now using with windows 10 for first time.