I’m having issues with 2.1.3 on multiple client pages as well, all running on Linux based servers. Most of them using Mailgun API for sending but other variants exist as well.
I can send test e-mails but when trying the forms (multiple form plugins as Contact Form 7, WPForms, Gravity Forms) I get nothing delivered.
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This reply was modified 3 years, 9 months ago by Joakim.
I have this exact issue on a client site. Upgrading to 0.12.11 breaks all legacy icons while 0.12.10 works just fine. Switching themes is not an option for us.