Microcosm - 2nd Seedrs crowd-funding round

Seems more like a GMail false positive to me. The yellow bar gives the explanation that similar messages were reported as phishing, maybe the keywords in the Seedrs email match the keywords of some of those spam penny stocks emails.

Quite possibly- this is why it's a good idea to authenticate your outbound email, so this sort of false positive is much less likely, and you end up in the inbox rather than the spam folder.