Based on the knowledge sources, when you have multiple users with the same email prefix in your Slack workspace, you should use the Slack User ID instead of the email prefix to tag a specific user. According to discussions in the [Elementary Slack community](https://slack.com/archives/C02CTC89LAX/p1669647715732819), the recommended format for using Slack User IDs is:

yaml models:   - name: my_model_name     meta:       owner: "<@USER_ID>"

For example, if the user ID is

DGN6MQ07L

, you would configure it as:

yaml meta:   owner: "<@DGN6MQ07L>"

This format (

<@USER_ID>

) is what [Slack's API documentation recommends](https://slack.com/archives/C02CTC89LAX/p1669647715732819) for mentioning users and ensures you're tagging the exact user you intend to. To find a user's Slack ID, you can use the Slack API method

users_lookupByEmail

. As mentioned in the [community discussion](https://slack.com/archives/C02CTC89LAX/p1669647715732819):

python client.users_lookupByEmail(email=email)["user"]["id"]

This approach is particularly important for Slack Enterprise customers or workspaces where multiple users might share the same email prefix but have different email domains, as the email prefix method (

@jessica.jones

) may not reliably distinguish between them.

Based on the knowledge sources, there is a mention of this exact issue in the [Elementary Slack community](https://slack.com/archives/C02CTC89LAX/p1690930833713179). A user reported: > "Let's say our Slack workspace has users with multiple email domains. Employee 1 (jane@company_url.com) left the company and the slack profile is deactivated. Employee 2 (jane@new_company_url.com) is an active employee. When I set

meta: owner: @jane

for a table, it tags the old, deactivated Jane account and not the new one." The user was able to resolve this by using the entire email address instead of the email prefix:

yaml meta:   owner: "jane@new_company_url.com"

However, the knowledge sources do not explicitly mention whether Elementary has a built-in feature to automatically skip deactivated Slack accounts when using email prefixes. The workaround provided was to use the full email address to distinguish between the active and deactivated accounts. If you'd like Elementary to add functionality to automatically filter for only active Slack accounts, you could consider opening a feature request on their [GitHub repository](https://github.com/elementary-data/elementary/issues/new?assignees=&labels=Feature+Request+%F0%9F%92%A1%2C+Triage+%F0%9F%91%80&projects=&template=feature_request.md&title=), as suggested by the Elementary team in similar feature discussions.