Email Deliverability Basics for Hosted Mailboxes

What SPF, DKIM, DMARC, mailbox reputation, and sending habits mean for business email delivery.

Overview

Email deliverability depends on both technical DNS records and everyday sending behavior. A mailbox can be configured correctly and still struggle if reputation signals are poor.

When this helps

Use this article when messages land in spam, recipients do not receive mail, or a domain is being prepared for business email.

Recommended steps

  1. Confirm SPF, DKIM, and DMARC records are present and aligned.
  2. Avoid sending bulk marketing from normal business mailboxes.
  3. Keep signatures lightweight and avoid suspicious attachments.
  4. Ask recipients to check spam folders and whitelist the sender when testing.
  5. Monitor bounce messages for clues about rejection reasons.

Information XMLA may need

  • Sending address
  • Recipient address
  • Bounce or error message
  • Date and time of the failed send
  • Whether the issue affects one recipient or many

Next step

Send XMLA the full bounce message if mail is rejected so the exact server response can be reviewed.

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