we have 400 to 500 hundred emails, when we concatenate them and put them in mailto: it does not work, browser automatically adds \"...\" in between emails and clicking link
If you need to email more than one (but not hundreds), the correct form should not have spaces but should have semicolons (especially if the users will likely use Outlook).
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If you want to automatically include a subject line add "?subject=This is the subject"
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