Discussed on forum
There seems to be bug in the overriding subwiki mail config with main wiki settings if subwiki mail config is not/partially set.
- mainwiki mail settings - SmtpServer1 with username1/password1
- subwiki mail settings - SmtpServer2 with anonymous access (username/password fields empty)
Subwiki is trying to send mail using SmtpServer2 with username1/password1 resulting in sending error
Subwiki is using SmtpServer2 with anonymous access
(In other words if smtp server on subwiki is set, then always use username/pwd from subwiki)