Our exchange server is allowed to relay as we also have custom apps that use it to send emails (incl our website). However we forward all outgoing mail to a smarthost at our ISP and our MX record is pointing at another ISP who forwards all the mail they receive on our behalf to us. This allows us to only open port 25 for that single incoming IP address so...no external relaying problems, and not even a sniff of an open port to anyone but that trusted IP. Charles Cresswell, IS Manager 020 7213 0728 The Association of Corporate Treasurers Ocean House 10/12 Little Trinity Lane London EC4V 2DJ tel: +44.(0)20 7213 9728 fax: +44.(0)20 7248 2591 www: http://www.treasurers.org Notice of Confidentiality This e-mail (and any attachments) is intended for the named addressee(s) only. It contains information that may be confidential. Unless you are the named addressee (or authorised to receive it for the addressee) you may not read, copy, use, or disclose it to anyone else. Unauthorised use, copying or disclosure is strictly prohibited and may be unlawful. If you have received this transmission in error, please notify the sender by telephone immediately 020 7213 0705 and delete the message from your e-mail system. The Association of Corporate Treasurers may monitor outgoing and incoming e-mails and other telecommunications on its e-mail and telecommunications systems. By replying to this e-mail you give your consent to such monitoring. The Association of Corporate Treasurers is a company limited by guarantee. It is registered in England at the above address, registration number 1445322. #ACT#