Migrated SBS Exchange to MS365 exchange -- DNS Questions - Mail "A" record and 2nd SPF txt record

Question

Migrated SBS Exchange to MS365 exchange -- DNS Questions - Mail "A" record and 2nd SPF txt record

Cheryl Dyck 20

I have migrated from SBS Exchange to MS 365 Exchange online.

Now that migration is complete, I think that the DNS records should have been changed to remove the DNS

Mail A Record

and the 2nd SPF (Txt) Record pointing at the old fixed IP.

Should I remove them or change them to something associated with MS 365 Exchange for Business

Anonymous

2023-08-08T06:08:38.6533333+00:00

Just wanted to check if the answer shared below helped. If it helped, then would request you to please "Accept the answer" as it would be helpful to others in the community as well.
Cheryl Dyck 20 Reputation points

2023-08-08T12:37:07.7033333+00:00

Shaofan,

I really asked about the two legacy exchange entries and their removal, I have a computer that was rebuilt that we can't get to the MS365 in outlook and it appears to be because it tries to keep autodiscovering to the old legacy exchange because of those records.

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Anonymous

2023-08-08T06:08:38.6533333+00:00

Just wanted to check if the answer shared below helped. If it helped, then would request you to please "Accept the answer" as it would be helpful to others in the community as well.
Cheryl Dyck 20 Reputation points

2023-08-08T12:37:07.7033333+00:00

Shaofan,

I really asked about the two legacy exchange entries and their removal, I have a computer that was rebuilt that we can't get to the MS365 in outlook and it appears to be because it tries to keep autodiscovering to the old legacy exchange because of those records.

Answer 1

Vahid Ghafarpour 23,385 Volunteer Moderator

SPF (Sender Policy Framework) records are used to specify which servers are allowed to send email on behalf of your domain. With Microsoft 365 Exchange Online, you must have an SPF record that includes Microsoft's mail servers. You can check the recommended SPF settings from Microsoft 365's.

And for the A record, the MX record is important. Ensure that your MX (Mail Exchange) record points to the Microsoft 365 Exchange Online servers. This record tells other mail servers where to deliver emails to your domain.

Cheryl Dyck 20 Reputation points

2023-08-08T12:35:15.3933333+00:00

Thanks for defining the records. Some useful information however I was really asking the question about the record additions for my old legacy exchange and if they should have been removed by my previous IT group. I suspect they should have been as they appear to be fighting with MS365 when a computer is being setup and pointing the installation at the server rather than at MS365, causing errors in the autodiscovery etc.

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Migrated SBS Exchange to MS365 exchange -- DNS Questions - Mail "A" record and 2nd SPF txt record

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