If a recipient sees an email arrive from a different address or domain than the one you sent from, there are two very different explanations. This guide helps you tell them apart. (For the short version of the intentional-rotation explanation, see Why does the recipient see a different sender or domain? (mailbox rotation).)
This is usually expected: mailbox rotation
To protect mailbox health, Maildoso automatically rotates and filters sending behind the scenes. Because of this, a recipient may occasionally see a different one of your domains than expected. This is intentional, and nothing changes operationally for you: When using a single domain on your Maildoso account, mailbox rotation is not possible due to the absence of additional domains for rotation. This configuration ensures that the recipient-visible "From" and reply addresses remain fixed, maintaining a consistent sender identity.
The recipient still receives the email normally.
If they reply, the reply is automatically routed back to the original mailbox that sent it.
You don't need to do anything — this is part of how we keep your mailboxes healthy over time. If you'd rather not have rotation on your account, contact us and we can disable it for you, though we generally recommend keeping it on for deliverability.
Getting the most out of rotation
Rotation works best, and leans least on any single domain, when two things are set up on your account: a redirect URL on your domains, and your Master Inbox. Without them, rotation has less healthy capacity to work with and can lean harder on the domains that aren't fully configured. See Domain redirects: what they do and how to set your redirect URL and Using your Master Inbox and connecting mailboxes to an email app to check both are set up on your account. Additionally, consider adding multiple domains if mailbox rotation is a requirement for your email strategy.
When it's not just rotation
Occasionally what looks like a sending issue is actually something else, for example:
The sending address shown to the recipient consistently belongs to a domain that has nothing to do with your account or plan.
The message content itself looks altered in transit (for example, the sender address inside the body text doesn't match who actually sent it).
The mismatch happens the same way every time, for the same mailbox, rather than varying as you'd expect from rotation.
If any of that sounds like what you're seeing, it's worth having us take a look at your specific account rather than assuming it's rotation.
What to send us if you're not sure
To help us check quickly, include:
The mailbox address you sent (or authenticated) from.
The address the recipient actually saw as the sender.
A copy of the message headers if you have them, or a screenshot of the received email.
Still not sure whether this is expected behavior or something we need to fix? Contact us with the details above and we'll review your specific case.