[note: quoted content modified slightly; it was rejected for some
reason previously]
Not a lot. In as far as this pertains to postfix, just ch-ange the primary 
add-ress and add aliases for the old ones. The reply-to address should be set 
to the new address.
See virtual_alias_maps and relocated_maps for details.

On 06.04.22 19:14, Alex wrote:
The best course of action is to bounce the messages with a
relocated_maps entry and force the sender to resend?

"the best" is subjective. using relocated_maps
http://www.postfix.org/relocated.5.html
you make sure people will not receive mail to the old address, and any mail must be re-sent to new address to pass.

someone may take this for unnecessary work for senders, which aren't responsible for recipient who wished to change their address.


How does using virtual_alias_maps affect my existing configuration if
I'm not currently using virtual domains or virtual maps? Currently the
server is processing mail for one domain listed in relay_domains.

virtual_alias_maps is processed each time a mail is received, so you are able to alias any mail recipient, even those in remote domains:

http://www.postfix.org/ADDRESS_REWRITING_README.html#virtual

I believe the documentation of virtual_alias_maps
http://www.postfix.org/postconf.5.html#virtual_alias_maps
should be bit more clear about this.

Op 6 apr. 2022 20:33 schreef Alex <mysqlstud...@gmail.com>:
We hae a set of users who wish to change their account names from
name123@ to just name@ and I'm trying to determine the best way to
manage that. The accounts are set up using actual password/shadow
entries with check_client_access to recipient restrictions. Users
retrieve mail using dovecot.

I've been thinking one approach would be to create password/shadow
entries for these new users and set their home directories to be the
same as their old ones, then also add new entries to the
check_client_access map. Does that make sense?

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