A colleague persists in trying to send e-mails with attachments of between 3Mb and 60 Mb to places such as China. The server is an Internet domain running under Windows 2000. The modem runs at 115,000bps over ISDN lines. The local e-mail system constantly comes up with 'too many threads' and no-one can either receive or send e-mails. Is there a technical solution or is e-mail discipline the answer? Is there a recommended maximun=m size?