Give a source a name of your own
On every plan
An admin can give any source a name of its own, such as "Office server" for a group of addresses we can only show by their network or reverse DNS name. Open the domain's Sources page and choose the source. At the top of its page, press Rename this source. Type the name in Name for this source, up to 100 characters, and press Save.
Where the name shows
Your name shows in place of the one we worked out, wherever we show the source: the sources page, the source's own page, readiness, alerts, summaries, the records export and the API. The source's own page keeps the computed name beside yours.
One name covers the domain and its subdomains, because they share their sources. Each other domain in the organization has sources of its own, so name the source there as well.
Only admins see the Rename this source button. Other members see the name.
Change or remove the name
Press Rename this source again and type a new name. To go back to the computed name, press Remove the label on the same page, or empty the field and save.
What a name changes
A name does not change whether the source passes DMARC. It changes how we count the source, because a named source counts as one of yours:
- An unidentified source that never passes DMARC is probably someone else sending as you. The readiness rule leaves it out, and so does the alert for a drop in the pass rate. Once you name the source, its mail counts like any other source of yours. If it fails, it can hold readiness back and lower the pass rate.
- Its mail no longer counts toward the share of mail that unidentified sources may send.
- Its addresses stay in it. When we look again at addresses we could not name, an address that now matches a service moves to that service. An address in a source you named stays where it is.
So name only the sources you know are yours. If one of them fails, fix it as well.
How long the name lasts
We delete a source nobody named once it has sent no mail for your history plus 30 days. A source you named is kept, so its name is still there if it sends again.
Removing the domain deletes its sources with their names. If you add the domain again later, it starts from nothing.
Published 27 October 2026 · Checked 27 October 2026