Is there somewhere to look up reasons for failing specific filters? I use the Marketo Deliverability Tool and we always pass all filters. Lately we fail Symantec Cloud and Gmail. The tool's Spam Audit does not provide reasons/explanations for these failures.
These have not been spam-like/suspicious type emails. They are marketing emails, but it is generic content about furniture. No spamy/suspicious text or subject line. All the pictures and links are good, working and have appropriate alt text. I know spam filters are just doing their job and are probably becoming increasingly sophisticated and sensitive, but it'd be nice to know why it's failing.
Any insight would be appreciated.