On Sat, Dec 28, 2013 at 01:10:55PM -0500, Charles Marcus wrote: > vacation.pl is, obviously, a perl script, so is using perl's > Mail::Sender module.
I think vacation.pl should be using sendmail(1) rather than SMTP to inject auto-response messages. The documentation for Mail::Sender v0.8.22 includes: TLS_allowed If set to a true value Mail::Sender attempts to use LTS (SSL encrypted connection) whenever the server supports it and you have IO::Socket::SSL and Net::SSLeay. The default value of ths option is TRUE! This means that if Mail::Server can send the data encrypted, it will. If TLS_allowed insists on authentication, then having it on by default is rather unwise. You may be able to unset this, but better yet, use local submission rather than SMTP for vacation re-injection. -- Viktor.