Hello Guys,
Follow the below steps to delete mail queues.
1. Login to server using remote Desktop (RDP).
2. Open command prompt & type the following in command prompt:
Quotecd "%plesk_dir%/Mail Servers/Mail Enable/Queues/SMTP/Outgoing"
3. Then type the following in command prompt:
Quotedel *.mai
4. Enter '
y' in command prompt
5. Now type the following in command prompt:
Quotecd Message
6. Type the following in command prompt:
Quotedel *. mai
7. It will take some time to finished. That's all.
Enjoy !!