IPO 9.1 Events Log SMTP stuck sending old notifications

[safenestvmem]

After years of this working ok and no recent changes. The SMTP Events Log seems to be backed up or over loaded. I am getting a trickle of weeks old Events via Email that say it will retry the Event notification but these are all types of Events at all times and dates going back a week.

I have rebooted several times and powered down. Any way to purge this log or should I do an SD card re-create?

Thanks!