Gmail now rejects bulk mail without DKIM, so my newsletter tool checks it before every send
I run Sendwell, a newsletter tool for small creators. Gmail started rejecting bulk email from domains without DKIM this week. A lot of small senders don’t know they’re missing it until open rates drop. Sendwell now checks SPF and DKIM before each send and tells you which record is missing, with the exact value to add. It doesn’t fix DNS for you yet. That’s next.