add instructions for SMTP access setup

[danger]

Summary

a built version is available at https://people.freebsd.org/~danger/committers-guide.html

[debdrup]

Noticed only one thing, otherwise it looks good to me.

article.xml

2330

There's an errant double-space here.

[allanjude]

Thank you for working on this

article.xml

2300

Should explain more about the /mail principal, and how to set it

[danger]

article.xml

2300

From my understanding, it should be created automatically during the referenced process at xref=kerberos-ldap

[rpokala]

FWIW, LGTM.

[danger]

resolved items pointed out in the reviews

[danger]

fix typo

[danger]

article.xml

2277

should there be the FreeBSD.org infrastructure?

[bcr]

OK to be added to the committers guide. Thanks!

[mat]

article.xml

96–97

<literal><systemitem class="fqdomainname">smtp.FreeBSD.org</systemitem>:587</literal>

2283–2284

<literal><systemitem class="fqdomainname">smtp.FreeBSD.org</systemitem>:587</literal>

2292

<literal>From:</literal>

2293

<literal><replaceable>yourusername</replaceable>@FreeBSD.org</literal>

2299–2300

<literal><replaceable>yourusername</replaceable>/mail</literal>

2305

<literal>@FreeBSD.org</literal>

2317

<literal><replaceable>yourusername</replaceable>@FreeBSD.org</literal>

2324–2325

(<literal>Authenticated sender: <replaceable>username</replaceable></literal>)

[bcr]

@mat: Ah, those are good additions to have. I should have noticed. I'm un-approving... ;-)

[danger]

I added those <literal> tags, but am getting the following errors, any ideas?

doc/en_US.ISO8859-1/articles/committers-guide/article.xml:97: element literal: validity error : Element systemitem is not declared in literal list of possible children

class="fqdomainname">smtp.FreeBSD.org</systemitem>:587</literal>

[danger]

• add the literal tags around the FQDNs

[bcr]

I think it fulfills the criteria for integration into the document. Approved!