>________________________________________ >From: Joe Acquisto-j4 <j...@j4computers.com> >Sent: Thursday, October 22, 2015 9:34 AM >To: users@spamassassin.apache.org >Subject: SOT - Fowarding mail to new service, keeping same MX, pitfalls
>This may not be the right place to discuss this, as it is a generic anti SPAM >query, but >please indulge and point me to where answers might be found. Or, just answer >if >you feel inclined. After this mornings SPF discussion . . . well, I'll ask >anyway. >An organization I know of is moving to o365 from their own mail system. For a >variety of reasons, the migration cannot be completely resolved "day one". >Thus, >we concocted a scheme of keeping MX as is, and having the current system simply >relay messages to o365 and have users start using o365 right away. >Everyone thought this a great idea, solving several issues, until, suddenly, >last >evening, I realized that we would be sending email that might appear "spoofed". >That is, from IP's that are not published as "ours". https://community.office365.com/en-us/w/exchange/simple-domain-sharing-for-smtp-email-addresses >I've not run this by any one else yet, hoping to either allay my concerns, or >raise >the alarm and have some suggested solutions, by asking a well versed group. >joe a.
