Re: [exim] envelope sender vs header from

On 2011-08-24 at 19:40 -0700, Jim Pazarena wrote:
> Is there an acl which can examine the From: name?

Yes, acl_smtp_data. Remember that the RFC822/2822/5322 headers come in
as part of the message body, after the DATA verb. So in acl_smtp_rcpt,
you haven't yet seen the From: header.

Also, note that per specification, From: contains one-or-more addresses.

Now, you might decide to declare that your MTA, implementing your
policy, only accepts emails with only one address in From:. That is
certainly your right, although someone sending such mails will tell
their users that you're the one not following the specifications.

Thus the ${address:...} expansion operator to get just the email
address, from the display name, is not guaranteed to work, unless you
first have an ACL rule which rejects messages with multiple addresses in
"From:". Instead, you need to use ${addresses:...} for reliability.

So, for reliability, if you want to just check the last email address to
occur in the From: header, then:

${reduce{${addresses:$h_from:}}{}{$item}}

-Phil