Well, of course it would be wonderful to prevent them altogether on lists, but ... Anyway, in an Exchange (Office 365) environment, you should be able to use the Powershell cmdlet Set-RemoteDomain to specify "AllowedOOFType" -- we have specified "none" on mail sent to the listserver. https://technet.microsoft.com/en-us/library/Aa997857(v=EXCHG.150).aspx However, I just tracked a case of someone being served off while out of town over the weekend of the Fourth, and was wondering if others had encountered similar. I'll contact MS about this, but thought this group might have more direct experience. Thanks, --Joe oh, fwiw: PowerShell> get-remotedomain | ft -auto Name DomainName AllowedOOFType ---- ---------- -------------- Default * External UGA Listserv listserv.uga.edu None UGA Listserv CC listserv.cc.uga.edu None ############################ To unsubscribe from the LSTSRV-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTSRV-L&A=1