E-mail sending stopped working after upgrade

[Moin]

Disabling starttls or certificate verification does not work any more

There are a lot of posts about this in #support so now we seem to have found the cause I thought it might be good to create a #bug topic about this containing only the actual issue described here Email Hostname Certificate Mismatch Causing sidekiq Queue Overload, Severe Site Instability - #47 by RGJ Long story short: Since 2.9.0 beta 4 the settings DISCOURSE_SMTP_OPENSSL_VERIFY_MODE and DISCOURSE_SMTP_ENABLE_START_TLS do not work correctly any longer. This seems to be related to the move to …