Hi Exim folks, I just stumbled across this issue and I would appreciate if any one can help me out on it.
I received an Email from Vodafone, with following relevant headers:- From: <[email protected]> Reply-To: Vodafone The email failed with the following error:- unqualified address not permitted: failing address in "Reply-To:" header is: Vodafone Exim denies the email when it reaches acl_check_data verify syntax # Deny if the headers contain badly-formed addresses. # deny !verify = header_syntax message = header syntax log_message = header syntax ($acl_verify_message) The $reply_address and $h_reply-to variables can’t be read nor removed anywhere while being accessible and its only accessible in acl_check_data, and as far as my testing over the past several days this remained valid. I tried different ways to remove Reply-To header if it contained unqualified address using following example in acl_mail and acl_rcpt but the issue again, I can’t read the reply-to header except in ACL data and failed to remove it:- warn !condition = ${if def:header_reply-to:{${if match{$h_reply-to}{^[a-zA-Z0-9.!#\$%&'*+\\/=?^_`\{|\}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]\{0,61\}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]\{0,61\}[a-zA-Z0-9])?)*\$}{1}{0}}}{1}} remove_header = Reply-To logwrite = Removed Reply-To header. Is there any way I resolve this issue? I know Vodafone aren't keeping it up with RFC standards, as they are expected to only submit qualified address in Reply-To header but what can I do? Maybe I can with your appreciated help. Btw, temporary fix, was to always remove Reply-To header or allow Vodafone host to send emails with unqualified address yet its not ideal, since hosts can change and God knows other mail servers I may expect to have similar issue. Also, loosening verify deny to warn seemed to be doable but not sure from security perspective if its OK? or is there any way I can perform verify headers syntax on my own? To the experts any recommendation or something worth noting to avoid while I’m hacking in this area? Looking forward, with thanks. Zakaria. -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
