ShipScript has been an eBay Community volunteer since 2003, specializing in HTML, CSS, Scripts, Photos, Active Content, Technical Solutions, and online Seller Tools.
If you download a sales transaction report from Seller hub's Payments tab, you could use the spreadsheet data to see which buyers are repeat buyers. However, eBay does prohibit using that data for "direct marketing", such as sending unsolicited email, messages, or spam to other eBay members. Although your intentions may be good, you may find yourself on the wrong side of eBay rules. Even if the message is not a solicitation or special offer, and is only a Happy Holidays type of message, you may want to be very careful.
https://www.ebay.com/help/policies/member-behavior-policies/membertomember-contact-policy?id=4262
Spam (email)
We don't allow our members to send each other spam. "Spam" is an email (or part of an email) that is both unsolicited and commercial in nature.
Unsolicited means the person who received the message didn't request it. Commercial means the message discusses buying, selling, or trading of goods or services.
Some examples of spam include:
- Unsolicited email offers sent to potential buyers
- Email messages sent to a member on a mailing list without that member's prior permission
- Invitations to join a mailing list that aren't related to your eBay Store
- Offers to buy or sell off eBay
- Email sent using eBay Messages (or features such as the Contact member link) to send unsolicited commercial offers
