I consider spam only if the only real reason for the post is the back link to the website: overly often posted weak articles (or too short fragments of those). I think that it won't be the case.
Bitcointalk makes all links inside posts no-follow (at least that's how it was the last time I checked) so this isn't a concern.
But yeah I'd check you're getting discussion from them after posting the first few just to make sure it doesn't look spammy (as mods are quick to delete low quality posts).
Noted, thanks.
There is no problem posting them since you said it's unique unless that old content is from expired domains?
notatether.com (my domain) is clearly not an expired domain, do a WHOIS search
I saw some people on another forum doing this by copy-pasting the old content from the old expired domain to their forum or new website and claim as its own content.
Yeah I don't have any of that BS here because the mailing list is sent from an email account with my domain name on it, so I can prove that I sent the mailing list emails anyway.