Hi,

Step 1: Double-check the email address of the customer or vendor you're sending the quotation/PO to. Ensure there are no hidden line breaks or extra spaces within the address. 

Step 2: Go to Settings > Technical > Email > Email Templates.

Open the template used for sending quotations/POs.

Look for any unexpected line breaks or carriage return characters within the template content. These might be hidden and not readily visible. You can try copying and pasting the content into a plain text editor to identify any formatting issues.

If you find any, edit the template and remove those characters.

Hope it Helps!

Thank you for all answer.

i found the solution of my problems. Line breaks is in our company name.

-----------

COMPANY NAME

-----------

and the problem is 

-----------

COMPANY NAME

------------

after delete that line breaks, problem solved.

thanks all.

Hi,

The error indicates that you have line breaks in your email address, subject, or similar fields. Remove those line breaks, and the issue should be resolved.

Hope it helps