We are switching from an in-house email system to Google Apps Premier. Google Apps has a mail gateway function built-in so that I can forward all mail to my 'old' email server if a mailbox for a user isn't found on the Google servers. This will let me pilot google apps for my workplace. I have created my account at google apps and setup the pilot program and I'm now at the point it wants me to edit my mx record. (I just took over here less than two weeks ago so bear with me)
It says to add Google as the first MX record. I looked up our current settings and they are as follows:
0 mail.mail123.com (our mail server)
15 groups.mail123.com (a mail list server)
20 caseyjones.dundee.net (an external mail list manager)
30 caseyjones.dundee.net (an external mail list manager)
40 random.mail123.com (who knows what this is, it actually fails)
My question is... if I add the Google Apps MX record as 0 and and it's setup to forward all mail to mbeabbs.mathsolutions.com and I set mbeabbs.mathsolutions.com as 15.... will there be any chance of losing mail if Google is setup correctly?
Should I just bump down the other records by 5 each?
Why would the prior IT person put in the list manager twice?
Google wants me to add the following records:
Is it safe to do this during work hours?
How long does it take an MX record to propagate?