The problem is that some ISP found this as non conform data and reject mails.
And AFAIK it's not conform to RFC.
AFAIK, Received headers allow for almost anything in parenthesis.
I went back and re-read your original post, and there's nothing in the ISP's error message to indicate that there's a problem with the Received headers.
-- Tom Collins - [EMAIL PROTECTED] QmailAdmin: http://qmailadmin.sf.net/ Vpopmail: http://vpopmail.sf.net/ Info on the Sniffter hand-held Network Tester: http://sniffter.com/