We have a mixed e-mail environment using MS Exchange and Lotus Notes. All mail is routed through an Exchange connector and mail that is not destined for one of our Exchange user accounts' is forwarded to Lotus Notes. Some e-mails are not being received by our Notes users. These missing e-mails are consistently from the same outside domains/accounts and can be tracked through our Barracuda spam appliance. Further tracking reveals that the Exchange server subsequently generates a non-delivery report with a status code of 5.6.1. These e-mails never make it to the Notes server at all.
Our research has revealed that a problem possibly exists with Exchange advertising 8 Bit MIME protocol which is not compatible with some other systems:
I thought that the Exchange SP3 Roll Up resolved this issue, but evidently I was wrong. I am not comfortable with editing the
metabase in Exchange so I was wondering if anyone knows of a work around in Notes to resolve this issue. Thanks!