I do think its NewsBlur, because I’m getting emails like this:
Mail Delivery Subsystem
Message blocked
Your message to [redacted]@newsletters.newsblur.com has been blocked. See technical details below for more information.
The response from the remote server was:
550 5.7.1 Message considered as SPAM (Score of 5.0/5.0 with BITCOIN_YOUR_INFO, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DMARC_PASS, HTML_FONT_LOW_CONTRAST, HTML_IMAGE_RATIO_04, HTML_MESSAGE, SPF_HELO_NONE, THIS_AD) - ImprovMX v2026.09.11