Issue with frappe.sendmail( Unknown Property name. [11:3: overflow-wrap])

Hi all,
1.On creation of a Leave Application, mail to leave approver is not being delivered.
I tried debugging and the sendmail function results in :
WARNING Property: Unknown Property name. [11:3: overflow-wrap].

While on User Creation, emails are being delivered.
Any workarounds for this??

Will this help?

Tried that.Scheduler for site is enabled.The issue still persists.

Any solution found?

From saturday(07/08/2021) this error is coming up. after this pymysql connection fails.

Did you find the root cause and solution for this error?