Copy Multiple E-Mail Addresses Into Mac Mail
Open Excel and paste the email addresses into the A column
Click on the B column and add this text into the excel formula bar: =A1&","
Double click the small dot in the bottom corner of the B cell.
Your email addresses will now all move over with commas – which is how Mac Mail formats and validates email addresses when you add them. You can now copy and paste the B column into mail email field.
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This was amazingly helpful for me! Thanks.