Thanks Scott, >hostname in the EHLO resolves to the IP of >the server, and the hostname in the reverse DNS entry resolves to the IP of
>the server just a couple more questions :) , does the IP address EHLO response resolves to and the IP reverse DNS entry resolves to need to be same? In our case, though both of them do resolve to IP addresses (same physical machine actually) they are 2 different IP's as we have configured our imail server on a different ip address. Also, just in case the mail admin really needs us to match ehlo and reverse dns, would it be possible for us to do so. Would we need to change something in our DNS or our Imail settings? Thanks very much, Sandeep -----Original Message----- From: R. Scott Perry [mailto:[EMAIL PROTECTED] Sent: 25 November 2003 12:40 To: [EMAIL PROTECTED] Subject: Re: [IMail Forum] EHLO request doesn't match the DNS Name Lookup >One of our clients have installed an ani-spam software which is >blocking our legitimate email. Their IT guy has sent the below >information suggesting why it might be refusing connections from our >server. > >WARNING: R[5] Connection rejected - Deny Connection for >ns0.myserver.com [217.xxx.xx.xxx] (PTR record does not match HELO/EHLO >string) Just laugh at this one. There are occasionally people who run silly anti-spam programs that do silly things. There is no need for the PTR record to match the HELO/EHLO. Tell them that if they want your mail, they should stop rejecting it. >Also, would it be correct (as per RFC/SMTP standards) for our email to >be blocked because EHLO response does not match DNS lookup or is it >just a very strict rule for blocking spam. It is perfectly RFC-compliant to have an EHLO that does not match the reverse DNS (just so long as the hostname in the EHLO resolves to the IP of the server, and the hostname in the reverse DNS entry resolves to the IP of the server). But some people are getting so paranoid about spam that they block legitimate mail that comes from servers that are RFC-compliant and aren't doing anything bad. -Scott --- Declude JunkMail: The advanced anti-spam solution for IMail mailservers. Declude Virus: Catches known viruses and is the leader in mailserver vulnerability detection. Find out what you've been missing: Ask about our free 30-day evaluation. --- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
