1. 1 Module 6 Managing Recipients and Aliases

2. 2 Address Rewriting alice@example.com bob@example.com carl@example.com Alice.Adams@example.com Bob.Barnes@example.com Carl.Carson@example.com /opt/insight/etc/postfix/canonical_sender: Alice.Adams@example.com Bob.Barnes@example.com Carl.Carson@example.com alice@example.com bob@example.com carl@example.com /opt/insight/etc/postfix/canonical_recipient: sender_canonical_maps = hash:/opt/insight/etc/postfix/canonical_sender recipient_canonical_maps = hash:/opt/insight/etc/postfix/canonical_recipient /opt/insight/etc/postfix/main.cf:

3. 3 Hiding Host Names  Masquerading intentionally hides internal hostnames  carl@paper.example.org  carl@example.org In main.cf: masquerade_domains = example.org

4. 4 Hiding Host Names  Masquerading intentionally hides internal hostnames  carl@paper.example.org  carl@example.org In main.cf: masquerade_domains = example.com, example.net, example.org, !sales.example.com masquerade_exceptions = alice, bob

5. 5 Directing Email Sent to Unknown Users Email sent to unknown users:  Returned to sender by default  Can be directed to an email user or alias  Beware of spammers In main.cf: luser_relay = alice local_recipient_maps =

6. 6 Relocating Users and Domains  Relocation maps used when users or domains move  Configure relocation rules in main.cf: relocated_maps = hash:/opt/insight/etc/postfix/relocated  Define relocation rules in lookup table: carl@example.comcarl@example.net @example.orgexample.net

7. 7 Relocating Users and Domains Relocated User Relocated Domain

8. 8 Types of Aliases  Postfix supports numerous types of aliases  SCOoffice Server stores aliases two ways Stored in LDAP Stored in a file

9. 9 Types of Aliases  From /opt/insight/etc/postfix/main.cf: alias_maps = hash:/opt/insight/etc/mail/aliases alias_database = hash:/opt/insight/etc/mail/aliases local_recipient_maps = $alias_maps ldap:ldapsource

10. 10 Types of Aliases  From /opt/insight/etc/mail/aliases: MAILER-DAEMON:admin@example.com abuse:admin@example.com postmaster:admin@example.com webmaster:admin@example.com root:admin@example.com virusalert:admin@example.com spam.police:admin@example.com apache:admin@example.com uucp:admin@example.com

11. 11 Types of Aliases  Process alias files with postalias(1):  # postalias hash:/opt/insight/etc/mail/aliases  Reload Postfix if a new alias lookup table is added to main.cf:  # postfix reload

12. 12 Exercise: Adding a New Alias File  Edit /opt/insight/etc/postfix/aliases  Process the alias file  Reload Postfix