Hi Everyone!
@David: The above added troubleshooting steps are only for affected users, not mandatory for all the users.
@Adam: Please try the following configuration (Admin Tab>Organizational Details>Mail Server Settings).
* E-mail type : SMTP
* TLS Enabled : Yes
* Port : 587
After saving the settings, please stop and start ManageEngine ServiceDesk Plus service from services.msc in the application server. Please try this and let us know the results.
@Hicsy: Thank you so much for sharing your inputs, much appreciated :-)
Mohamad Jawad
ManageEngine ServiceDesk Plus | AssetExplorer