OT - Sendmail accept_unresolvable domains

Stephen Swaney steve.swaney at fsl.com
Fri Dec 9 17:52:47 GMT 2005

> -----Original Message-----
> From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
> Behalf Of Steve Campbell
> Sent: Friday, December 09, 2005 11:45 AM
> Subject: OT - Sendmail accept_unresolvable domains
> Can a few of you give me your preference/experience on the Sendmail
> feature
> accept_unresolvable_domains?
> Does it help? Do any of your users complain? I'm getting a lot of
> undeliverable bounces due to  unknown users and thought this might be a
> nice
> way of reducing them.
> Thanks
> Steve Campbell
> campbell at cnpapers.com
> Charleston Newspapers


If you're referring to the sendmail configuration option:

dnl FEATURE(`accept_unresolvable_domains')dnl

This should most definitely be disabled. All of our servers and customers
servers are configured this way and have been for years. It merely requires
that the sending server an A or MX record in DNS. 

We used to get complaints a few years back but now all legitimate mailers
(and most spammers) have DNS records. We typically see a small percentage of
rejections from this rule but now receive no complaints. 


Stephen Swaney
Fort Systems Ltd.
stephen.swaney at fsl.com

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