Die map kann beliebig für jede Empfänger Domain erweitert werden, zugehöriges destination_rate_delay kann ebenfalls individuell angepasst werden.
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nano /etc/postfix/transport_gmail
# anpassen - erweitern
/\@gmail\.com$/ smtp-gmail:
/\@hotmail\.com$/ smtp-gmail:
/\@outlook\.com$/ smtp-gmail:
/\@live\.com$/ smtp-gmail:
/\@aol\.com$/ smtp-gmail:
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nano /etc/postfix/master.cf
# über
#628 inet n - - - - qmqpd
# einfügen
smtp-gmail unix - - n - 1 smtp
-o syslog_name=smtp-gmail
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nano /etc/postfix/main.cf
# unter
#transport_maps = hash:/etc/postfix/transport
# einfügen
transport_maps = regexp:/etc/postfix/transport_gmail
# über
# Rspamd
# einfügen
# gmail rate limits
smtp-gmail_destination_rate_delay = 90s
smtp-gmail_destination_concurrency_limit = 1
smtp-gmail_destination_recipient_limit = 2
smtp-gmail_initial_destination_concurrency=1
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systemctl restart postfix
journalctl -u postfix@-.service | grep smtp-gmail