Pulse Email Alerts Stopped all of a Sudden (Metabase version 0.36)

We have 3 - 4 pulses setup , which have failed to trigger post 8th august
Even Send Email now fails to work or get any response

Metabase version - 0.36
Browser Used - Chrome
Db - Postgres
OS - Mac Yosemite 10.10

Please suggest any possible fix for the same , we are transitioning data files to another client based on this.

Hi @A_B
Post “Diagnostic Info” from Admin > Troubleshooting.
If “Send email now” also fails, then it’s probably a problem with the SMTP server - check the log for errors, Admin > Troubleshooting > Logs.
Latest release is 0.36.3