On 2025-07-09 at 09:37:09 UTC-0400 (Wed, 9 Jul 2025 09:37:09 -0400
(EDT))
John Griffiths via Postfix-users <mozill...@grifent.com>
is rumored to have said:
What is the difference between listing host in virtual vs
mydestination in main.cf?
Read the ADDRESS_CLASS_README file in the documentation. You can find it
and all the other readme files with 'postconf readme_directory'.
Addresses in mydestination domains are local addresses that represent
real system user accounts on the Postfix host.
Addresses in either of the virtual classes (virtual alias and virtual
mailbox domains) either deliver to local user mailboxes via aliases or
via a map into mailboxes that are not owned by a regular user, with
access via IMAP or POP.
Is there an advantage to one over the other?
Having the local hostname in mydestination allows mail to u...@host.name
or just 'user' to deliver without the use of either virtual mechanism to
the system mailbox of that user. That is the default because it is
simple and unsurprising.
Having the local hostname NOT in mydestination and using virtual aliases
or virtual mailboxes means that you must define which u...@host.name
addresses you wish to exist and how you want them delivered. This
arguably allows for greater security because the existence of
u...@host.name as a mail address does not imply the existence of the
system-level account named 'user' on host.name.
I read the header for virtual and don't really understand the
difference.
The header of that file is just the man page for the format, not full
documentation. The discussion of both classes of virtual address is in
the VIRTUAL_README file.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo@toad.social and many *@billmail.scconsult.com
addresses)
Not Currently Available For Hire
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