nanog mailing list archives
Re: OT? /dev/null 5.1.1 email
From: Tony Finch <dot () dotat at>
Date: Wed, 6 Jul 2005 11:20:52 +0100
On Wed, 6 Jul 2005, Pekka Savola wrote:
On Tue, 5 Jul 2005, Adi Linden wrote:Make your secondary mx aware of all the valid recipient addresses.Are there mechanisms in postfix or sendmail to do this automatically, or should this be done out-of-band? I've tried looking for this feature, but found nothing; maybe I don't know the right terms to search for.
Exim supports call-forward recipient verification, using syntax like "require verify = recipient/callout". This is very useful if you have any kind of organizational complexity in your email system which makes it hard for an MX to know which local parts are valid in all of its domains. For example, my MXs relay email to about 50 departmental email servers and act as a secondary MX for some other domains. We have no special knowledge of which addresses are valid in these domains, and it would be hard to make that possible because of the variety of software running on the departmental email servers. However if they are run well such that they completely verify their recipient addresses during the SMTP conversation, then so can we. Tony. -- f.a.n.finch <dot () dotat at> http://dotat.at/ BISCAY: WEST 5 OR 6 BECOMING VARIABLE 3 OR 4. SHOWERS AT FIRST. MODERATE OR GOOD.
Current thread:
- OT? /dev/null 5.1.1 email Jim Popovitch (Jul 05)
- Re: OT? /dev/null 5.1.1 email Randy Bush (Jul 05)
- Re: OT? /dev/null 5.1.1 email Jim Popovitch (Jul 05)
- Re: OT? /dev/null 5.1.1 email Randy Bush (Jul 05)
- Re: OT? /dev/null 5.1.1 email Jim Popovitch (Jul 05)
- Re: OT? /dev/null 5.1.1 email Adi Linden (Jul 05)
- Re: OT? /dev/null 5.1.1 email Jim Popovitch (Jul 05)
- Re: OT? /dev/null 5.1.1 email Pekka Savola (Jul 05)
- Re: OT? /dev/null 5.1.1 email Eric A. Hall (Jul 05)
- Re: OT? /dev/null 5.1.1 email Tony Finch (Jul 06)
- Re: OT? /dev/null 5.1.1 email Jim Popovitch (Jul 05)
- Re: OT? /dev/null 5.1.1 email Randy Bush (Jul 05)
- Re: OT? /dev/null 5.1.1 email Jim Popovitch (Jul 05)
- Re: OT? /dev/null 5.1.1 email Tony Finch (Jul 06)
- Re: OT? /dev/null 5.1.1 email Randy Bush (Jul 05)
- Re: OT? /dev/null 5.1.1 email Owen DeLong (Jul 06)
- Re: OT? /dev/null 5.1.1 email Daniel Senie (Jul 05)
- Re: OT? /dev/null 5.1.1 email Brad Knowles (Jul 05)
- Re: OT? /dev/null 5.1.1 email Jim Popovitch (Jul 05)
- Re: OT? /dev/null 5.1.1 email Todd Vierling (Jul 05)
- Re: OT? /dev/null 5.1.1 email Steven M. Bellovin (Jul 05)
- Re: OT? /dev/null 5.1.1 email David Andersen (Jul 05)