Wietse,
let me first thank you for your answer. A great honour for me, getting my first post answered by the inventor of postfix itself. So let me take the chance and thank you for postfix, overall :-) Your answer led me in the right direction "No mail provider domain names in ..." In fact my specific solution was pretty simple: Just deleting the virtual domains only added for my getmail-ed accounts. I even don't need virtual_alias_maps entries, as my recipient addresses (and their mailboxes) are (still) "user1@emailprovider1.example", e.g. michae...@rocketmail.com. Was my intention not to collect mails into you@really-local-domain, but within own mailboxes. Has IMHO the charm, that I can use dedicated Thunderbird (or any MUA) accounts, incoming (IMAP) pointing to my VPS, outgoing (SMTP) pointing to "real" mail provider. So thank you very much again, Michael Am 13.08.2018 um 19:50 schrieb Wietse Venema: > There is no need to list your mail provider domain names in Postfix. > That just results in unecessary 'user unknown' errors. > > Instead, use virtual_alias_maps (NOT: virtual_alias_domains) > mapping of: > > user1@emailprovider1.example you@really-local-domain > user2@emailprovider2.example you@really-local-domain > user3@emailprovider3.example other@really-local-domain > > Where only really-local-domain delivers to dovecot. > > No mail provider domain names in virtual_alias_domains. > No mail provider domain names in virtual_mailbox_domains. > No mail provider domain names in mydestination. > > You can even even reverse the virtual_alias_mapping with > smtp_generic_maps, depending on who you are sending email to. > That is a longer story. I can provide that if you are interested. > > Wietse >
