Asking Constituents to Add to Safe Sender List

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We switched over to a new site just over a year ago from a site we'd had for over 10 years and we're still working on updating and modernizing everything and making sure our site and electronic communications are the best they can be. One of the recent topics internally has been on email deliverability and ensuring emails are landing in inboxes, not spam folders. While we have done a fair amount of work with segmentation based on engagement ratings recently and our deliverability statistics are slowly improving, I was recently asked if we could include language on the "Thank you for Signing Up!" page we have that would encourage people to add us to their safe senders list. On the flip side, another person involved has concerns about this because we do send emails from more than one email address. So I was wondering if any of you have suggestions - have you done something similar? What kind of language tends to be the most effective?
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