Hello @Firojuddin Saifi,
Thank you for reaching out to Atlassian Community!
It's possible to disable the invitation email when adding new customers.
Please, go to Project settings > Customer notifications (Classic project) or Service Desk Settings > Notifications > Customer notifications (Next-gen project).
On this page, you can edit or disable the notifications:
If you have any other questions regarding this matter, please let us know.
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