I've just migrated a client to Office 365, and now it seems like any emails they send to other Microsoft accounts are either being classified as spam or getting quarantined. I've checked all their DNS records, including DKIM, DMARC, and SPF, and everything looks good. Could this issue be related to the fact that the tenant is only about two weeks old? I cut over the mail just a couple of hours ago, so any insights would be greatly appreciated!
5 Answers
When you say you’ve checked "all DNS records," do you mean you verified SPF, DKIM, etc.? If not, definitely run checks through mxtoolbox to make sure everything is set up properly.
In hindsight, it would've been smart to set lower TTLs on your DNS records a couple of days before the migration. Just double-check everything now, but mostly, you’ll have to be patient and let it resolve over time.
Just a heads up, lot of DNS filtering systems can be suspicious of any new domains for up to 30 days. It can be tricky, especially for a fresh Office 365 tenant.
Absolutely, new tenants don’t get any trust initially. Microsoft sees them as potentially sketchy until they establish a good reputation. I’ve noticed it typically smooths out in about a week if all the configurations are done right.
Yeah, it’s pretty common for new Office 365 tenants to get flagged as spam until they build up some sender reputation. Microsoft’s spam filters can be a bit overzealous right off the bat. Just keep things clean, and it should improve in a few days if everything’s set up correctly.
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