Hi The simpler solution for me: sender_dependent_default_transport_maps = mysql:/etc/postfix/mysql_sender_default_rotate_map.cf
cat mysql_sender_default_rotate_map.cf query = select transport from virtual_transport where active='1' order by rand() limit 1; +----+-----------------------+--------+ | id | transport | active | +----+-----------------------+--------+ | 1 | smtp1 | 1 | | 2 | smtp235 | 1 | | 3 | smtp12 | 1 | | 4 | smtp185 | 1 | | 5 | smtp29 | 1 | | 6 | smtp149 | 1 | | 7 | smtp30 | 1 | +----+-----------------------+--------+ and you must set transportname in master.cf and rate (if you need) on main.cf On 27.01.2021 18:39, Wietse Venema wrote: > combro2k combro2k: >> Hi there, >> >> I've been looking for some days for a solution I need to create for a >> customer. >> What we want to achieve is throttling the delivery of mails in the queue. >> Right now we are using 'default_destination_rate_delay = 1s' which allows >> us to send approx. 3600 to each destination maximum in 1 hour timeframe. >> But we want to be more specific like 5000 mails globally,or 16000 globally, >> whatever we want to do. >> I've looked into PolicyD to achieve this, but I am stuck at the >> implementation of it at the queue system of Postfix; >> Right now I can only see it work with the smtpd_recipient_restrictions and >> smtpd_end_of_data_restrictions configuration option but not with the queue >> service. >> Am I missing something or I am overthinking it? > You can implement sub-second rate delays with parallel deliveries. > Below is an example from an last-year's email. > > Wietse > > In /etc/postfix/master.cf: > > smtp1 unix - - n - - smtp > smtp2 unix - - n - - smtp > ... > smtpN unix - - n - - smtp > > In /etc/postfix/main.cf: > > smtp1_destination_rate_delay = 1 > smtp2_destination_rate_delay = 1 > ... > smtpN_destination_rate_delay = 1 > > transport_maps = > inline:{ > { $myhostname = $local_transport } > { localhost = $local_transport } > { localhost.$mydomain = $local_transport } > # Other domains that don't deliver over SMTP... > } > randmap:{ smtp1:, smtp2:, ..., smtpN: } > > This syntax requires Postfix 3.0 or later. --