Hi, we have 4000 customers, 1500 of them * don't have any mail-address. * or some of them are sharing a mail-account So far, I didn't import these 1500 people as customers. But now I have to assign tickets to these people, e.g. to document that work on their PCs was done. How should I realize this? So far, the customers are idetified by their mail-address - OK, I can switch this to their ads-name. But what about the mail-address-entry of customers that * share a mail-account? CustomerUserEmailUniqCheck => 0 ? * don't have a mail-address? Set UserEmail to not-required? Or leave it as required and use a unique dummy-mail-address? How can I prevent that mails can be sent to customers without a mailaddress or with a dummy-mail-address? Does this work? What are the consequences? Any experience on this issue? Bye, Alex