Kyle,
I am not sure what you mean with "rerun the mailer to endpoints ".
I did try the mass mail function from the user manager and it works.
Unfortunaly the automatic mails for renewals do not work.
I see 2 new messages about failures in the log:
# Event time Event type Message Table affected Table Key Change Username Full name IP Address Log Priority Id
1 2019-02-13 00:29:02 Error log Mailer mail sending error: Could not instantiate mail function. - --- System - 72.14.187.212,72.14.187.212 Error 839
2 2019-02-13 00:29:02 Error log Mailer mail sending error: Could not instantiate mail function. - --- System - 72.14.187.212,72.14.187.212 Error 838
In the "Messages Sent" page I can see which 2 messages the system tried to send, so I will manually send them today. But that is not why I installed CbSubs.