Date: Mon, 22 Sep 2003 01:48:21 +0300 From: Alin-Adrian Anton <aanton@reversedhell.net> To: questions@freebsd.org Subject: Re: Spam and virus filter for mailserver Message-ID: <3F6E2AB5.2010605@reversedhell.net> In-Reply-To: <200309211255.20067.dgw@liwest.at> References: <200309211255.20067.dgw@liwest.at>
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This is a cryptographically signed message in MIME format. --------------ms050401080906010405060106 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Daniela wrote: >Hi! > >We have the following situation and don't know what to do: > >I have one POP3 account with alias adresses for the network clients, and every >client configured the mailer not to get mail destined for the other clients. >Now we get so much spam and viruses, and I decided to set up a mail server, >recieve the mail for all the clients, and the clients get their mail from my >mail server, keeping their current mail adresses. > >The clients run M$ Winblows eXPensive, so I need an antivirus program that >runs on FreeBSD (should be free). Can anyone recommend a good mail reader >that can fetch mail as a daemon, stores mail in a format readable by KMail or >Evolution, and has a console interface (I don't run X often)? It should also >be somehow able to put the mail in different folders based on the value of >some headers. > >And what mail server should I use? It should be secure and not use up many >resources (security has the highest priority). > >Is this stuff possible at all? Please help us. >Thanks in advance. > >Daniela > > >_______________________________________________ >freebsd-questions@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-questions >To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > > > > I think qmail is the most suitable mail server. I think and many others do, that it's the most secure and resource-saver mail server out there. And it's free, of course, you'll find it in the ports. Qmail-scanner is a virus scanner for qmail, but I do not recommend it, concerning resources and security. The most lightweight filtering system for qmail which comes to my mind seems to be qmail-qfilter (a small C proggie), google for it and use it. See the sample scripts, one of them filters any executable attachment, like .vbs,.etc... Add .scr, .pif and .bat to them ;). I use it and my 'new' qmail-queue file looks like this now (read the docs, it is a script, hackish): --------------------------------- #!/bin/sh exec /var/qmail/bin/qmail-qfilter /var/qmail/bin/filter1 -- /var/qmail/bin/qmail-inject -n --------------------------------- Where filter1 is a script which filters mail using the header details. PS: parse the headers carefully ;) Alin. --------------ms050401080906010405060106 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 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJATCC AtswggJEoAMCAQICAwqocjANBgkqhkiG9w0BAQQFADBiMQswCQYDVQQGEwJaQTElMCMGA1UE ChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNv bmFsIEZyZWVtYWlsIElzc3VpbmcgQ0EwHhcNMDMwOTAxMjI1NzE3WhcNMDQwODMxMjI1NzE3 WjBJMR8wHQYDVQQDExZUaGF3dGUgRnJlZW1haWwgTWVtYmVyMSYwJAYJKoZIhvcNAQkBFhdh YW50b25AcmV2ZXJzZWRoZWxsLm5ldDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB AOFQIPsz6GsCqBulxVsYpJ2I0jfIBLPuNsNpkK4qh1TxzVVJ3dOd3giojIFX2Vnhm7s1RdTm 0bPJ720UVqdsxuLtQ0hIBbg+oK492I8Vd8rAH7ByDE++L8dRaAP6IcUGZQh2/7GnjCdrnmta vFJ02oya/5RMqcvUIe3ggFlzpSw0nDuRbTOKfRJAUP4wI56SY63E9gUQL0IBqzEKzcJQTAnk G0/C8MKTMpFBZ89pwNvFaOuPXLCIPIiPPy/luxEOgjYz9mwEzDShznISwDg327swWmNXEcDF ZRnpnQya41RPAGJiw8e6xirvPpn3Evd07UVEovGsP2CHoPfA/JvdK3UCAwEAAaM0MDIwIgYD VR0RBBswGYEXYWFudG9uQHJldmVyc2VkaGVsbC5uZXQwDAYDVR0TAQH/BAIwADANBgkqhkiG 9w0BAQQFAAOBgQAsf0Fs94uUNfAA2GC/CXQaccTiQJm7rRwhe+ttblOD0PH9jSUauQAKP7sh BNBEhJ+j5JU8GlTEi/ZKCBGqFTJm2pvbvy7QdQUe2J3VQwmCGYiJTu/m1iAVwhhRVtzZVC/u 1EnXDzel2vnkJ5wOP5en2N8wd1wpAii1A1K3ck7q0TCCAtswggJEoAMCAQICAwqocjANBgkq hkiG9w0BAQQFADBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcg KFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3Vpbmcg Q0EwHhcNMDMwOTAxMjI1NzE3WhcNMDQwODMxMjI1NzE3WjBJMR8wHQYDVQQDExZUaGF3dGUg RnJlZW1haWwgTWVtYmVyMSYwJAYJKoZIhvcNAQkBFhdhYW50b25AcmV2ZXJzZWRoZWxsLm5l dDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAOFQIPsz6GsCqBulxVsYpJ2I0jfI BLPuNsNpkK4qh1TxzVVJ3dOd3giojIFX2Vnhm7s1RdTm0bPJ720UVqdsxuLtQ0hIBbg+oK49 2I8Vd8rAH7ByDE++L8dRaAP6IcUGZQh2/7GnjCdrnmtavFJ02oya/5RMqcvUIe3ggFlzpSw0 nDuRbTOKfRJAUP4wI56SY63E9gUQL0IBqzEKzcJQTAnkG0/C8MKTMpFBZ89pwNvFaOuPXLCI PIiPPy/luxEOgjYz9mwEzDShznISwDg327swWmNXEcDFZRnpnQya41RPAGJiw8e6xirvPpn3 Evd07UVEovGsP2CHoPfA/JvdK3UCAwEAAaM0MDIwIgYDVR0RBBswGYEXYWFudG9uQHJldmVy c2VkaGVsbC5uZXQwDAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQQFAAOBgQAsf0Fs94uUNfAA 2GC/CXQaccTiQJm7rRwhe+ttblOD0PH9jSUauQAKP7shBNBEhJ+j5JU8GlTEi/ZKCBGqFTJm 2pvbvy7QdQUe2J3VQwmCGYiJTu/m1iAVwhhRVtzZVC/u1EnXDzel2vnkJ5wOP5en2N8wd1wp Aii1A1K3ck7q0TCCAz8wggKooAMCAQICAQ0wDQYJKoZIhvcNAQEFBQAwgdExCzAJBgNVBAYT AlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgGA1UE ChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2VydmljZXMg RGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkGCSqG SIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMzA3MTcwMDAwMDBa Fw0xMzA3MTYyMzU5NTlaMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3Vs dGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNz dWluZyBDQTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxKY8VXNV+065yplaHmjAdQRw nd/p/6Me7L3N9VvyGna9fww6YfK/Uc4B1OVQCjDXAmNaLIkVcI7dyfArhVqqP3FWy688Cwfn 8R+RNiQqE88r1fOCdz0Dviv+uxg+B79AgAJk16emu59l0cUqVIUPSAR/p7bRPGEEQB5kGXJg t/sCAwEAAaOBlDCBkTASBgNVHRMBAf8ECDAGAQH/AgEAMEMGA1UdHwQ8MDowOKA2oDSGMmh0 dHA6Ly9jcmwudGhhd3RlLmNvbS9UaGF3dGVQZXJzb25hbEZyZWVtYWlsQ0EuY3JsMAsGA1Ud DwQEAwIBBjApBgNVHREEIjAgpB4wHDEaMBgGA1UEAxMRUHJpdmF0ZUxhYmVsMi0xMzgwDQYJ KoZIhvcNAQEFBQADgYEASIzRUIPqCy7MDaNmrGcPf6+svsIXoUOWlJ1/TCG4+DYfqi2fNi/A 9BxQIJNwPP2t4WFiw9k6GX6EsZkbAMUaC4J0niVQlGLH2ydxVyWN3amcOY6MIE9lX5Xa9/eH 1sYITq726jTlEBpbNU1341YheILcIRk13iSx0x1G/11fZU8xggM7MIIDNwIBATBpMGIxCzAJ BgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYD VQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQIDCqhyMAkGBSsOAwIa BQCgggGnMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8XDTAzMDky MTIyNDgyMVowIwYJKoZIhvcNAQkEMRYEFG47GOr2Q5Pjr9pnxUc36HmEOUB/MFIGCSqGSIb3 DQEJDzFFMEMwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFAMAcG BSsOAwIHMA0GCCqGSIb3DQMCAgEoMHgGCSsGAQQBgjcQBDFrMGkwYjELMAkGA1UEBhMCWkEx JTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1RoYXd0 ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBAgMKqHIwegYLKoZIhvcNAQkQAgsxa6Bp MGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQu MSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQIDCqhyMA0G CSqGSIb3DQEBAQUABIIBAN5/SNy+efPTNopZwOvJ9lcYgsYKyl0tz0qNUrq3SprAta+vK5zf iytSgKWi34iIsrIXhTpP/sc1I3cHAqYL6tYJH+Wsh/C6zOVi39w8F9ixj7OQZQ08xUCV/e1l Z7P9EzJC1/wByNSA6OBtZazxOpoHIeI9T6LCwKxEyVl7wMteATEKhjsFN6gQuYUROlxoM8S2 BM4V+BxjMgG67Pn3ENOSmCZo3elf4I77LyHNkVZa+otbs6RDuJAOUo0J4//gDjr5NSbbd+06 3mWeNAmKWLs+nlgPC6sKg6hl6Kg3ZaKQywvynbpQJrTmAEaU/09JX0SvGh2hlFWohOdIsnbz JoEAAAAAAAA= --------------ms050401080906010405060106--
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