While sending invoice to client directly from quickbooks mail options , the subject are printing like this "Invoice KTSC/20-21/178 from Kalinda"

Hi there, s-prakash.

I'm glad to see you posting here in QuickBooks Community. I'll provide information and steps when sending invoices and what information shows in the subject field. 

When sending an invoice to a client directly from QuickBooks, the subject showing on the printing page depends on the company name you've set up in your account. I'd suggest checking it from there to verify if it's the same details showing in the invoice.

Here's how:

1. Click the Gear icon at the top right corner.
2. Choose Account and settings. Then, select the Company tab.
3. Go to the Company name section. From there, you'll see the company name entered.

Once verify that the company name is different from subject field in the invoices, I'd recommend logging into your QuickBooks account using a private browser. This will verify if your cache is causing the problem.

Use these keyboard shortcuts based on the browser you're using. 

• For Internet Explorer of Firefox, press Ctrl + Shift + P.
• For Chrome, press Ctrl + Shift + N.
• For Safari, hold down Command + Shift + N.

If it works in incognito, I'd recommend clearing the cache of your regular browser. This removes the history or log of sites so you can start with a clean slate. If the steps above didn't work, use another supported browser as an alternative.

Please refer to this article to see different information about setting up invoices to send from your Gmail address: Send invoices from your Gmail address FAQ.

Please know that you're always welcome to post if you have any other concerns. Wishing you and your business continued success.