Email integration not Working in Rocket chat


In my organization, I installed Rocket chat successfully with help of official Rocket chat documents… All SMTP settings are done , but I didn’t receive Email notification And I can’t invite new user , If I click a ( send test mail to user) option, In User interface shows ( mail sent Successfully) but I didn’t receive any mail from Rocket chat . kindly ,please let me know what issue is this…

I’m getting this issue too