O'Reilly logo

Sendmail, 3rd Edition by Bryan Costales

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Interpret the Output

Some debugging output references C-language structures that are internal to sendmail. For those, it will help if you have access to sendmail source. One subroutine, called printaddr( ), is used to dump complete details about all the recipients for a given mail message. This subroutine is used by many categories of debugging output, but rather than describe it repeatedly, we describe it once, here, and reference this description as needed.

The sendmail program’s internal printaddr( ) subroutine prints details about addresses. The sendmail program views an address as more than just an expression such as gw@wash.dc.gov. Internally, it represents every address with a C-language structure. The printaddr( ) routine prints the values stored in most of the items of that structure. Its output looks like this:

subroutine: ra= addr:
        mailer mnum(mname), host hname
        user `uname', ruser `rname'  
        state=state, next=link, alias aname, uid user-id, gid group-id
        flags=fhex<names here>
        owner=owner, home="home", fullname="fname"
        orcpt="oparam", statmta=mta, status=status
        finalrcpt="finalrcpt"
        rstatus="rstatus"
        statdate=statdate

First, sendmail prints the address in memory, ra, of the C-language struct that contains the information necessary to deliver a mail message. It then prints the information in that structure:

addr

The mail address as text—e.g., you@uofa.edu.

mnum

Number of the delivery agent to be used (an index into the array of delivery agents).

mname

Symbolic name of that ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required