Re: [swinog] Swissonline mx problems?
Hi Rog Some of our customers would send e-mails to swissonline.ch answer: mx.hispeed.ch. - 62.2.95.11 [Could not connect: Got an unknown RCPT TO response: 451 4.1.8 Possibly forged hostname for 69.2.200.182] Anyone got same answer? Yes. It seems they are blocking mails with possibly forged hostnames. Is this a method to blocking spam or is it against sobig.f? My business mail server don't has this problem. The mails to hispeed are going out. Probably they are checking DNS records and if the name isn't found the sender will be blocked. Any suggestion? Gruss Adrian Senn -- |p mbox: [EMAIL PROTECTED] _ | |g mbox: [EMAIL PROTECTED] ASCII ribbon campaign ( )| |www: http://www.senn.ch/ - against HTML email X | | http://www.cevinet.ch/vCards / \| -- [EMAIL PROTECTED] Maillist-Archive: http://www.mail-archive.com/swinog%40swinog.ch/
Re: [swinog] Swissonline mx problems?
Hi Roger, It seems that the dns reverse to forward check is failed. nslookup 69.2.200.182 182.200.2.69.in-addr.arpa name = host182.69.2.200.maximumasp.com. nslookup host182.69.2.200.maximumasp.com. ** server can't find host182.69.2.200.maximumasp.com: NXDOMAIN mx.hispeed.ch. - 62.2.95.11 [Could not connect: Got an unknown RCPT TO response: 451 4.1.8 Possibly forged hostname for 69.2.200.182] Cheers Erich -- * Erich Hohermuth IP Engineer - SolNet (AS 9044) PGPKEY-46A08FCB * -- [EMAIL PROTECTED] Maillist-Archive: http://www.mail-archive.com/swinog%40swinog.ch/
Re: [swinog] Swissonline mx problems?
Read RFC1912 On Thu, Aug 28, 2003 at 08:18:10 +0200, Roger Buchwalder wrote: mx.hispeed.ch. - 62.2.95.11 [Could not connect: Got an unknown RCPT TO response: 451 4.1.8 Possibly forged hostname for 69.2.200.182] -- _;\_Philipp Morger / PHM2-RIPE System Network Administrator /_. \ Dolphins Network Systems AGPhone +41-1-847'45'45 |/ -\ .) Email: [EMAIL PROTECTED] -'^`- \; Don't send mail to:[EMAIL PROTECTED] -- [EMAIL PROTECTED] Maillist-Archive: http://www.mail-archive.com/swinog%40swinog.ch/
Re: [swinog] Swissonline mx problems?
Adrian Senn wrote: Hi Rog Some of our customers would send e-mails to swissonline.ch answer: mx.hispeed.ch. - 62.2.95.11 [Could not connect: Got an unknown RCPT TO response: 451 4.1.8 Possibly forged hostname for 69.2.200.182] Anyone got same answer? Yes. It seems they are blocking mails with possibly forged hostnames. Is this a method to blocking spam or is it against sobig.f? I know other ways to block spam and sobig. 1. Remove MX entry (like t-systems last friday) 2. Shut down mailserver My business mail server don't has this problem. The mails to hispeed are going out. Probably they are checking DNS records and if the name isn't found the sender will be blocked. yes, one of our customers had a problem because he had a other IP for the outgoing mail then the MX. Fix reverse DNS for 195.134.153.38 or use your ISPs mail server Any suggestion? Gruss Adrian Senn Regards Candid Aeby -- [EMAIL PROTECTED] Maillist-Archive: http://www.mail-archive.com/swinog%40swinog.ch/
Re: [swinog] Swissonline mx problems?
In RFC 1912: For every IP address, there SHOULD be a matching PTR record in the in-addr.arpa domain. Philipp Morger wrote: Read RFC1912 On Thu, Aug 28, 2003 at 08:18:10 +0200, Roger Buchwalder wrote: mx.hispeed.ch. - 62.2.95.11 [Could not connect: Got an unknown RCPT TO response: 451 4.1.8 Possibly forged hostname for 69.2.200.182] -- Mit freundlichen Grüssen Candid Aeby Internet Pipeline AG Hardstr. 235 8005 Zürich Tel +41 1 277 75 55 / Fax +41 1 277 75 50 http://www.pipeline.ch [EMAIL PROTECTED] -- [EMAIL PROTECTED] Maillist-Archive: http://www.mail-archive.com/swinog%40swinog.ch/
Re: [swinog] Swissonline mx problems?
that's the part I like most: Failure to have matching PTR and A records can cause loss of Internet services similar to not being registered in the DNS at all. On Thu, Aug 28, 2003 at 10:18:45 +0200, Candid Aeby wrote: In RFC 1912: For every IP address, there SHOULD be a matching PTR record in the in-addr.arpa domain. Philipp Morger wrote: Read RFC1912 On Thu, Aug 28, 2003 at 08:18:10 +0200, Roger Buchwalder wrote: mx.hispeed.ch. - 62.2.95.11 [Could not connect: Got an unknown RCPT TO response: 451 4.1.8 Possibly forged hostname for 69.2.200.182] -- _;\_Philipp Morger / PHM2-RIPE System Network Administrator /_. \ Dolphins Network Systems AGPhone +41-1-847'45'45 |/ -\ .) Email: [EMAIL PROTECTED] -'^`- \; Don't send mail to:[EMAIL PROTECTED] -- [EMAIL PROTECTED] Maillist-Archive: http://www.mail-archive.com/swinog%40swinog.ch/
