email server currently has 140 errors like this for the last 24 hours
dsn=4.0.0, stat=Deferred: xxx: No route to host
I call that an invalid email address.
Yes it's a static IP, yes it pings, but no there's no email server there.
Back online now. Thanks for the follow-through.
OK once one of the queued messages gets through I'll PM you to say when I've re-enabled the account.