Well, considering that I found the woman through numerous Rootsweb posts in which she listed her email address, she had already consented to sharing this particular email address publicly. I do the same with my genealogy email address (in fact, this is likely where I got the idea to have a separate email account for genealogy). Also - I did share with her that I was including her name and genealogy email in my source citations, as she is the expert who was sharing her transcriptions of the Langenau church records on Rootsweb. She also has continued to list this email address in posts since the GDPR went into effect, so she is continuing to use this address as her genealogy email