Public mailbox creation issue when `@` character is used in mailbox name

[nrauso]

When creating a public mailbox on a mail server instance running on NS8, the configuration wizard suggests that a wildcard mail address will also be created automatically.

The Name field validator currently allows the use of the @ character in the public mailbox name. This can be a valid and useful scenario on mail server instances that manage multiple mail domains, where the administrator may want the public mailbox to be created only for a specific domain (e.g. mypublic@domain.tld).

However, allowing the @ character in the public mailbox name leads to a misconfiguration that causes the list-addresses API to fail.

Steps to reproduce

• Create a mail server instance on NS8.
• Create a new public mailbox.
• In the Name field, use a value containing the @ character (e.g. mypublic@domain.tld).
• Complete the wizard (a wildcard address is created automatically).
• Run the following command from CLI:

api-cli run module/mail1/list-addresses | jq

Actual behavior

The API fails with validation errors because the local part of the address contains the @ character, which violates the expected schema:

Validation errors: [addresses.1: Must validate one and only one schema (oneOf) 
addresses.1.local: Does not match pattern '^[^@]+$' 
addresses.1: Must validate all the schemas (allOf)]

Full API output:

Validation errors: [addresses.1: Must validate one and only one schema (oneOf) addresses.1.local: Does not match pattern '^[^@]+$' addresses.1: Must validate all the schemas (allOf)]
{
  "adduser_domains": [
    "domain.tld"
  ],
  "addgroup_domains": [],
  "addresses": [
    {
      "local": "postmaster",
      "destinations": [
        {
          "dtype": "public",
          "name": "postmaster"
        }
      ],
      "description": "RFC-mandatory postmaster alias",
      "atype": "wildcard",
      "delete_forbidden": true
    },
    {
      "local": "mypublic@domain.tld",
      "destinations": [
        {
          "dtype": "external",
          "name": "vmail+mypublic@domain.tld"
        }
      ],
      "atype": "wildcard"
    },
    {
      "atype": "adduser",
      "local": "admin",
      "description": "Builtin administrator user"
    },
    {
      "atype": "adduser",
      "local": "testuser",
      "description": "Test User"
    }
  ]
}

Components

• mail:1.7.4

See also

Discussion https://mattermost.nethesis.it/nethesis/pl/tmmy76yz1fg55ppho3cmnsfwpw

[stephdl]

QA — ns8-mail 1.7.8-dev.1

Fixes: NethServer/dev#7827 — Public mailbox creation issue when @ character is used in mailbox name

---

What was changed

• Added validation in the UI to reject the @ character in public mailbox names.
• An error message is now displayed when an invalid character is entered in the Name field.

---

Test environment

• NS8 instance with the mail module installed
• At least one mail domain configured

---

Test cases

1. Create a public mailbox with @ in the name (regression)

1. Open the mail module UI.
2. Navigate to Public mailboxes → Create.
3. In the Name field, enter a value containing @ (e.g. mypublic@domain.tld).
4. Expected: An error message is shown inline. The wizard cannot proceed.

---

2. Create a public mailbox with a valid name

1. Open the mail module UI.
2. Navigate to Public mailboxes → Create.
3. In the Name field, enter a valid name without @ (e.g. mypublic).
4. Complete the wizard.
5. Expected: The mailbox is created successfully.

---

3. Verify you can list the public mailbox

After creating a public mailbox with a valid name verify the UI can list the public-mailbox

4. Edit an existing public mailbox — no regression

1. Open an existing public mailbox.
2. Edit its settings without touching the name.
3. Save.
   Expected: Changes are saved without errors.