For XEP-0045: Multi-User Chat* :

• Make sure your server is v0.3+
• Add mod_muc in the modules block
• Configure it as per your requirements

modules:
    ...
    mod_muc: 
        ## Configuration here

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0156: Discovering Alternative XMPP Connection Methods (HTTP)* :

Look at the Examples Section of XEP-0156 and create appropriate files for your server. Only one of host-meta and host-meta.json is required to pass this test. However it is recommended to create both.

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0398: User Avatar to vCard-Based Avatars Conversion* :

• Configure mod_avatar

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0384: OMEMO Encryption* :

• Make sure your server is v17.12+
• Add mod_pubsub, mod_caps to your modules list
• In mod_pubsub, add pep plugin.

modules:
    ...
    mod_caps: {}
    mod_pubsub:
        plugins:
            - "pep"

• Remove/comment these lines to enable OMEMO by default

force_node_config:
  ## "eu.siacs.conversations.axolotl.*":
  ##  access_model: whitelist

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0065: SOCKS5 Bytestreams (Proxy)* :

• Make sure your server is v2.0+
• Add mod_proxy65 to modules list

modules:
    ...
    mod_proxy65: {}

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0077: In-Band Registration* :

Enable it only if you want anyone to create an account directly from a client

• Make sure your server is v0.1+
• Add mod_register to modules list

modules:
    ...
    mod_register:
        ...
        access_from: allow
        access: register

• Set the access rules for register to allow, if you want to allow anyone to make an account

access_rules:
  register:
    - allow

• Read more on mod_register configuration.

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0363: HTTP File Upload* :

• Make sure your server is v0.9+
• Add mod_http_upload to modules list

modules:
    ...
    mod_http_upload: {}

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0352: Client State Indication* :

• Add mod_client_state to modules list

modules:
    ...
    mod_client_state: {}

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0198: Stream Management* :

• Add mod_stream_mgmt to modules list

modules:
    ...
    mod_stream_mgmt: {}

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0163: Personal Eventing Protocol* :

• Make sure your server is v1.1.2+
• Add mod_pubsub and mod_caps to modules list
• In mod_pubsub, add pep plugin.

modules:
    ...
    mod_caps: {}
    mod_pubsub:
     ...
     plugins:
        - "pep"
     ...

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0368: SRV records for XMPP over TLS* :

• Set up your DNS to have an appropriate SRV record. For more information go here

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0357: Push Notifications* :

• Make sure your server is v17.08+
• Add mod_push to modules list

modules:
    ...
    mod_push: {}

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0313: Message Archive Management* :

• Add mod_mam to modules list

modules:
    ...
    mod_mam: {}

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0115: Entity Capabilities* :

• Make sure your server is v1.1.2+
• Add mod_caps to modules list

modules:
    ...
    mod_caps: {}

• Make sure your server is v1.1.2+

Note: These instructions are valid only for this particular server, because of the software running on it.

For Contact Addresses for reporting abuse* :

• In mod_disco, add server_info with email for reporting abuse:

modules:
    ...
    mod_disco:
        server_info:
        -
            modules: all
            name: "abuse-addresses"
            urls: ["mailto:abusecontact@yourserver.com"]

Note: These instructions are valid only for this particular server, because of the software running on it.

For Roster Versioning* :

In mod_roster, set versioning to true.

modules:
    ...
    mod_roster:
        versioning: true

Make sure your server is running v0.4+

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0160: Best Practices for Handling Offline Messages* :

• Add mod_offline to modules list
• Set configuration for mod_offline. Read more about it from here

modules:
    ...
    mod_offline: 
     ## Configuration here

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0191: Blocking Command* :

• Add mod_blocking, mod_privacy to modules list

modules:
   ...
   mod_blocking: {}
   mod_privacy: {}

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0280: Message Carbons* :

• Make sure your server is v15.03+
• Add mod_carboncopy to modules list

modules:
    ...
    mod_carboncopy: {}

Note: These instructions are valid only for this particular server, because of the software running on it.

For XEP-0313: Message Archive Management (for Multi-User Chat)* :

• Make sure your ejabberd is at least v15.06+
• Add mod_mam to your configuration
• Set default to always in mod_mam.

modules:
    ...
     mod_mam:
        default: always
    mod_muc:
    ...
    default_room_options:
        mam: true
    ...

Note: These instructions are valid only for this particular server, because of the software running on it.