> I guess at some point all the services go through some shared dll or
> service to query the user+password info.

DLLs  cannot  be  shared  by  different  processes--a separate copy is
loaded  in  the process space of each daemon, so auth-related failures
are  confined  to  a  single  process  at  a time. Of course, the same
failure  may occur across processes and DLLs at the same time (loss of
ODBC  connectivity, SAM corruption, whatever), but this would not be a
case of one daemon "infecting" others.

> but, we have had many instances, over the years, where people reported only
> SMTP AUTH failures without saying anything about POP failures.

Eric's  test  was  the  best.  If  the  server  is not announcing AUTH
support,  clients will not send AUTH credentials.

There are also situations in which SMTPD ceases to recognize the ESMTP
AUTH commands, whether or not they are announced.

None  of  these  are  happy situations, but, in all cases, Telnet will
give you a much firmer grasp of which is going on.

-Sandy


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