Path: csiph.com!x330-a1.tempe.blueboxinc.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!nx01.iad01.newshosting.com!newshosting.com!novia!news-out.readnews.com!transit4.readnews.com!panix!not-for-mail From: Grant Edwards Newsgroups: comp.os.linux.networking Subject: Re: Can I by-pass my ISP to email? Date: Tue, 16 Aug 2011 14:05:46 +0000 (UTC) Organization: PANIX Public Access Internet and UNIX, NYC Lines: 17 Message-ID: References: NNTP-Posting-Host: dsl.comtrol.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: reader1.panix.com 1313503546 14237 64.122.56.22 (16 Aug 2011 14:05:46 GMT) X-Complaints-To: abuse@panix.com NNTP-Posting-Date: Tue, 16 Aug 2011 14:05:46 +0000 (UTC) User-Agent: slrn/pre0.9.9-102 (Linux) Xref: x330-a1.tempe.blueboxinc.net comp.os.linux.networking:497 On 2011-08-15, Richard Kettlewell wrote: > The original claim was that MTAs reject mail from addresses which are > not the target of an MX record. Pascal's point is that this is nonsense > because they'd have to discover the MX record given an IP address, which > isn't possible. In my experience, some SMTP servers look up the MX record for the host name provided in the smtp "HELO" handshake. The might also compare that to the IP address that the connection is coming from -- but that's less common since incoming and outgoing mail are often handled by different machines. -- Grant Edwards grant.b.edwards Yow! But was he mature at enough last night at the gmail.com lesbian masquerade?