On 11/28/2011 08:51, David Phillips wrote: > One of our subscribers is getting this error message: > > > mail.ourserver.tld gave this error: > <email-2010.dsl.edu>: Helo command rejected: 551 > AUTO_DYNAMIC_IP_PATTERN_DSL2 551 Your mail server appears to use a > Dynamic IP address. 551 Contact an admin or use our website for help. > > I am not literate enough in mail service jargon to know what that > means, or how to help our subscriber. > Several "best practices" documents recommend, some quite strongly, that a legitimate mail server should have a static IP address that resolves to a meaningful (as opposed to generic) hostname, and *that* hostname should resolve to the same IP address. Some sites reject messages from systems which ignore this recommendation. -- Paul Russell, Senior Systems Administrator OIT Messaging Services Team University of Notre Dame ############################ To unsubscribe from the LSTOWN-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa.exe?SUBED1=LSTOWN-L&A=1