We do not offer Support in 3rd party Email service. Since there are additional settings to connect your email with Office 365, you may need to contact Microsoft Office Support.
Article Related to adding Domain and/or DNS records in Office 365:
https://support.office.com/en-us/article/find-and-fix-issues-after-adding-your-domain-or-dns-records-in-office-365-40398b0b-bdd0-4afd-ab5e-b5ae6b7990bf
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