This is probably easy for some of you but I can't seem to find the answer. We are moving our email to Exchange Online soon and while they do provide the DNS entry we need to change to I can't figure out exactly how to change it. Our current BIND9 entries are:
; Mail Exchangers
MX 10 mail ; Primary Mail Server
MX 50 mail2 ; Secondary Mail Server
The record Microsoft provides is: blah-blah.mail.protection.outlook.com
My knee jerk reaction is to just change to the following:
; Mail Exchangers
MX 10 blah-blah.mail.protection.outlook.com ; Primary Mail Server
Would that be accurate or should this be a CNAME instead?
DNS MX record change
Re: DNS MX record change
You want an MX record. And you probably want two of them, with different weights, both pointing to different MS servers which they presumably tell you. You may also want TXT records set up for SPF and maybe also stuff to do with DMARC.
The future appears to be RHEL or Debian. I think I'm going Debian.
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
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- Posts: 18
- Joined: 2020/04/13 17:42:58
Re: DNS MX record change
We have working SPF records. Changing it to the MS provided one is straight forward.
Is the way I want to change the MX record accurate? If it is I will dig up a second record from them to have two if at all possible.
Edit: In thinking about it I am guessing I am missing a trailing "." so that DNS doesn't attempt to append 'company.com' to the address correct? So it should be:
MX 10 blah-blah.mail.protection.outlook.com. ; Primary Mail Server
Is the way I want to change the MX record accurate? If it is I will dig up a second record from them to have two if at all possible.
Edit: In thinking about it I am guessing I am missing a trailing "." so that DNS doesn't attempt to append 'company.com' to the address correct? So it should be:
MX 10 blah-blah.mail.protection.outlook.com. ; Primary Mail Server
Re: DNS MX record change
Well I can show you (obscured) ours but they point to mimecast before the mail goes off to O365:
Code: Select all
$ dig MX company.com
...
;; ANSWER SECTION:
company.com. 3600 IN MX 10 eu-smtp-inbound-2.mimecast.com.
company.com. 3600 IN MX 10 eu-smtp-inbound-1.mimecast.com.
...
The future appears to be RHEL or Debian. I think I'm going Debian.
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
-
- Posts: 18
- Joined: 2020/04/13 17:42:58
Re: DNS MX record change
Thanks. I gather from that info that my second posting was correct. I need the trailing "." or it will append our DNS suffix to it.