I don't know...there is no limit to subscriptions. Have you tried subscribing him manually? If that works see if he can post to the list. Have him bcc you when he posts so you will know whether the post makes the list or not. Joan In a message dated 12/11/2011 5:50:55 P.M. Eastern Standard Time, alf.christophersen@medisin.uio.no writes: I have a customer that has had a subscription on gennor-l for a long time, but now has changed his email address. But his subscribe message to the -request address never turns up, while his old address do work ok. He tell he is subscribed to about 20 or so other lists that work nicely with new address, so why is he blocked? Is there a global limit of subscriptions that he is passing or is the spam blockers having a bad day again blocking him from sending subscription messages?