For the last 2-3 months, email forwarding for my domain lanznar.net has been failing sporadically. Forwarding succeeds 50-75% of the time, I'd estimate, but the remainder do not seem to get forwarded. When test emails to lanznar.net fail, the sender receives a bounce message which often is itself sent to spam, so senders are mostly not aware of any failure. I had used this forwarding for years with a very low volume, and ca. 2 years ago changed the destination to my new ISP and started using the domain as my primary email. After that change everything worked fine, as before (so I believe the account is set up correctly), until ca Jan/Feb this year when these failures began.