I know I have other issues after my upgrade the other day…and I’m working them on another thread.
The upgrade was:
From:
OH 2 on a raspberry Pi. (openHAB 2.5.0~S1566-1 (Build #1566))
To:
openHAB 2.5.0~S1645-1 (Build #1645)
It is possible those other errors are the cause of my rules, that send mail, being broken. But, in the mean time, since I changed from the old 1.x action sendMail to the new 2.x binding, I wanted to confirm I’ve got the setup right. I have done more than one shutdown and cache clear. Another caveat, the 1.x action was installed when I did the upgrade and the 2.x binding was installed before the action was removed.
Currently any time a rule sends mail I get the following:
The name 'sendMail' cannot be resolved to an item or type
My thing file is thus:
Thing mail:smtp:Gmail [ hostname="smtp.gmail.com", sender="<mygmail>@gmail.com", security="TLS", username="<mygmail>@gmail.com", password="my password" ]
A sample of the offending rule:
...
...
val mailActions = getActions("mail","mail:smtp:Gmail")
mailActions.sendMail(mailTo, "Motion Detected", message)
...
I’ve read the wiki and a couple of threads here…not sure I got it right. But, it seems to me the error is caused by something other than my thing or rule. But, my syntax may be completely wrong… 
And, yes I need to go set up two factor on the gmail account…but, one thing at a time. 