On 9/26/07 2:36 AM, "James Isolder" <[EMAIL PROTECTED]> wrote:
> I have recently added greylisting to my exim installation and now some of the > mail servers that are connecting are giving me the following error. > > <<< 451 greylisted - try again later <[EMAIL PROTECTED]>... Deferred: > 451 greylisted - try again later <<< 503 valid RCPT command must precede > DATA <<< 451 greylisted - try again later <[EMAIL PROTECTED]>... > Deferred: 451 greylisted - try again later <<< 503 Valid RCPT command > must precede DATA Status: 4.3.0 Diagnostic-Code: SMTP; 451 greylisted - > try again later. > > The email is then deferred and eventually bounced. Is there a easy way to > avoid this problem while still greylisting. Greylisting has to involve whitelisting broken servers you need to receive mail from (and should involve whitelisting trusted servers--if a server is known to pass greylisting and you want its mail, why insert delays?). The 503 from Exim is required by RFC...the sending server should not be sending DATA if all the recipients produced temporary errors. Turning off pipelining can help. --John -- ## List details at http://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/
