Date: Sat, 10 Jun 2006 19:53:25 +0200 From: =?ISO-8859-1?Q?Erik_N=F8rgaard?= <norgaard@locolomo.org> To: Rodrigo Mufalani <rodrigo.pinto@mxm.com.br> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: autoreply postfix Message-ID: <448B0715.5000104@locolomo.org> In-Reply-To: <003f01c64467$27a96150$4e05a8c0@oramx> References: <003f01c64467$27a96150$4e05a8c0@oramx>
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This is a cryptographically signed message in MIME format. --------------ms050701040703000602030803 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Rodrigo Mufalani wrote: > I want configure postfix autoreply, for undelivery mails > > If one user does not exists. The short advice: do not. In the case you mention, user does not exist, your postfix should give a 5XX error back to the sending system. That system will then take care of error response to the sender. Secondly, by sending error messages whether to the one in the "MAIL FROM" envelope field or (possibly worse) to the one in any of the "reply-to", "from" or "return-path" mail header fields you will get problems with spam which often forge these fields: 1) In case the recipient of the error message exist, it is likely not the one who should have your error message. 2) In the case the recipient does not exist, this causes a double- bounce, the error message cannot be delivered and is returned to the postmaster mailbox - which is you. A correctly configured server should only generate error messages to local users when a local user's mail-delivery fails. This is already done by postfix when a delivery attempt results in an 5XX error code. Cheers, Erik -- Ph: +34.666334818 web: http://www.locolomo.org X.509 Certificate: http://www.locolomo.org/crt/8D03551FFCE04F0C.crt Key ID: 69:79:B8:2C:E3:8F:E7:BE:5D:C3:C3:B1:74:62:B8:3F:9F:1F:69:B9 --------------ms050701040703000602030803 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIL5jCC Be8wggPXoAMCAQICCQCNA1Uf/OBPDDANBgkqhkiG9w0BAQUFADCBmTELMAkGA1UEBhMCRVMx GDAWBgNVBAoTD0RhZW1vbiBTZWN1cml0eTEeMBwGA1UECxMVQ2VydGlmaWNhdGUgQXV0aG9y aXR5MR4wHAYDVQQDExVDZXJ0aWZpY2F0ZSBBdXRob3JpdHkxJDAiBgkqhkiG9w0BCQEWFWNh QGRhZW1vbnNlY3VyaXR5LmNvbTEKMAgGA1UEBRMBMDAeFw0wNjA0MjAxMzE2NTBaFw0wNzA0 MjAxMzE2NTBaMGIxCzAJBgNVBAYTAkVTMRUwEwYDVQQKEwxMb2NvTG9tby5PcmcxFjAUBgNV BAMTDUVyaWsgTm9yZ2FhcmQxJDAiBgkqhkiG9w0BCQEWFW5vcmdhYXJkQGxvY29sb21vLm9y 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