backup mx

after googling around, I managed to solve my problem as it follows:

smtpd_recipient_restrictions =
permit_mynetworks,
check_client_access hash:/etc/postfix/pop-before-smtp,
permit_mx_backup,
check_relay_domains,
reject_unauth_destination

and it works ;)

for my own knowledge, exactly which line keeps the mails queued until
the main mx goes back online ?

permit_mx_backup or check_relay_domains (which checks the domains
against which file ?)

thanks,

petre

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