Thank you @frankie_P for the quick response. I know there are always ideas competing for development, but I think the return on investment for the level of effort is strong. Everyone's inboxes are crowded with unread e-mails and our attention is attracted to pictures more than words. It's also easy to A and B test to see how much favicons help with the open rate.
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We need more favicons. I am thinking about switching platforms if we can't get more favicons, they help people open up e-mails, so what is more important than that?
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