Yes, Not sure what happened for the entire issue, speeds have returned for the domains, and I had a good explanation of why some emails failed.
I use wildcards to allow me to create emails address on on the fly and these emails get pushed to a single account.
Apparently when system try to check if the email address is not valid, the Zen systems return not valid for wildcard email addresses even though they would work,
Strange never had this experience before (and been using this practice for years) , all it will mean is more calls to zen for email mapping.
Got to say Zen support was excellent as usual,
Pipex(dial up => adsl) => Nildram => Zen