---
title: mail
description: Internet mail addresses in Mailbox form, as described in RFC 2821 . The server does not ensure that mail addresses conform to RFC 2821, however.
component: pingds
version: 7.2
page_id: pingds:schemaref:at-mail
canonical_url: https://docs.pingidentity.com/pingds/8.1/schemaref/at-mail.html
llms_txt: https://docs.pingidentity.com/pingds/llms.txt
docs_for_agents: https://developer.pingidentity.com/build-with-ai/docs-for-agents.md
superseded_by: https://docs.pingidentity.com/pingds/8.1/schemaref/at-mail.html
---

# mail

Internet mail addresses in Mailbox form, as described in [RFC 2821](https://www.rfc-editor.org/rfc/rfc2821.html) . The server does not ensure that mail addresses conform to RFC 2821, however.

Be aware that matching is case-insensitive: `(mail=bjensen@example.com)` matches `BJENSEN@example.com`

Applications supporting internationalized domain names must use the ToASCII method described in [RFC 3490](https://www.rfc-editor.org/rfc/rfc3490.html) to produce subdomain components of the Mailbox form.

|                             |                                                                                                            |
| --------------------------- | ---------------------------------------------------------------------------------------------------------- |
| *Single value*              | false: multiple values allowed                                                                             |
| *Origin*                    | [RFC 4524](https://datatracker.ietf.org/doc/html/rfc4524)                                                  |
| *Usage*                     | userApplications                                                                                           |
| *Ordering matching rule*    | [caseIgnoreOrderingMatch](mr-caseIgnoreOrderingMatch.html)                                                 |
| *OID*                       | 0.9.2342.19200300.100.1.3                                                                                  |
| *User modification allowed* | true                                                                                                       |
| *Schema file*               | 00-core.ldif                                                                                               |
| *Names*                     | mail, rfc822Mailbox                                                                                        |
| *Used by*                   | [inetOrgPerson](oc-inetOrgPerson.html), [mailGroup](oc-mailGroup.html), [pilotPerson](oc-pilotPerson.html) |
| *Substring matching rule*   | [caseIgnoreIA5SubstringsMatch](mr-caseIgnoreIA5SubstringsMatch.html)                                       |
| *Syntax*                    | [IA5String](s-IA5String.html)                                                                              |
| *Equality matching rule*    | [caseIgnoreIA5Match](mr-caseIgnoreIA5Match.html)                                                           |