Date: Thu, 26 Jan 2017 08:31:14 +0100 From: Bernt Hansson <bah@bananmonarki.se> To: =?UTF-8?Q?Trond_Endrest=c3=b8l?= <Trond.Endrestol@fagskolen.gjovik.no>, FreeBSD questions <freebsd-questions@freebsd.org> Subject: Re: Envelope rewrite by sendmail? Message-ID: <741c3823-bc0a-f59b-d828-9afc8be9bacf@bananmonarki.se> In-Reply-To: <alpine.BSF.2.20.1701252134520.1006@mail.fig.ol.no> References: <alpine.BSF.2.20.1701252134520.1006@mail.fig.ol.no>
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On 2017-01-25 21:42, Trond Endrestøl wrote: > Hi, > > I have users with email addresses ending in a long suffix. Combine > this with long names in front of the @ sign, and it immediately gets > very tedious to type an email address. > > We have a shorter domain name, and I was thinking of creating a small > SMTP server to serve this short domain name and simply forward email > to the main SMTP server. > > It is not possible to switch the main SMTP server to serve the short > domain name. > > Here's an example: > > A mail messages arrives on the small SMTP server addressed to > shorty@short.tld. Sendmail, though the aliases mechanism, forwards > the message to long.name@some.incredible.long.domain.name.tld. > > Antispam measures such as SPF will flag the small SMTP server as not > allowed to send email on behalf of the originator. > > Thus, prior to forwarding each message, the small SMTP server will > need to masquerade as the originator and rewrite the envelope's from > address to an address within the short.tld domain. > > Can this be accomplished using sendmail? Would the short address of > the receiver suffice or should I use a fixed address regardless of the > originator and/or the ultimate receiver? > > The OS on the small SMTP server will be FreeBSD 11. > > Any pointers are appreciated. > http://www.sendmail.org/~ca/email/doc8.12/cf/m4/masquerading_relaying.html
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