Hi,
Ive a postfix server which is used to relay emails to an external smtp
server, this was done to prevent the receiving smtp server from being
flooeded by to many messages per hour which i did by using the debug command
and a sleep 6, in addition to this i added a transport map to slow down
delivery even more for certain hosts/recipient domains:
[MAIN.CF FILE]
transport_maps = hash:/etc/postfix/transport
smtpslow_destination_rate_delay = 310s
smtpslow_destination_concurrency_limit = 1
smtpslow_destination_recipient_limit = 1
debugger_command = /bin/sleep 6
[TRANSPORT FILE]
yahoo.com smtpslow:[external.server.com]:25
yahoo.co.uk smtpslow:[external.server.com]:25
googlemail.com smtpslow:[external.server.com]:25
gmail.com smtpslow:[external.server.com]:25
hotmail.com smtpslow:[external.server.com]:25
hotmail.co.uk smtpslow:[external.server.com]:25
outlook.com smtpslow:[external.server.com]:25
outlook.co.uk smtpslow:[external.server.com]:25
aol.co.uk smtpslow:[external.server.com]:25
aol.com smtpslow:[external.server.com]:25
comcast.com smtpslow:[external.server.com]:25
live.com smtpslow:[external.server.com]:25
live.co.uk smtpslow:[external.server.com]:25
msn.com smtpslow:[external.server.com]:25
msn.co.uk smtpslow:[external.server.com]:25
sbcglobal.net smtpslow:[external.server.com]:25
verizon.net smtpslow:[external.server.com]:25
bellsouth.net smtpslow:[external.server.com]:25
yahoo.ca smtpslow:[external.server.com]:25
cox.net smtpslow:[external.server.com]:25
ymail.com smtpslow:[external.server.com]:25
btinternet.com smtpslow:[external.server.com]:25
btinternet.co.uk smtpslow:[external.server.com]:25
btopenworld.co.uk smtpslow:[external.server.com]:25
btopenworld.com smtpslow:[external.server.com]:25
mail.com smtpslow:[external.server.com]:25
The smtpslow is set to use one thread only in master.cf
[MASTER.CF FILE]
smtpslow unix - - n - 1 smtp -D
-o syslog_name=postfix-smtp-slow
-o max_use=1
The -D (debug) is a bit of a dirty hack as it basically calls a sleep for 6
seconds between messages to ensure it doesn't hit the external hosts message
per hour limit.
This all works fine, however ive noticed a big problem
If i send 3 emails to my hotmail.com address they all rightly have a 5
minute (310s) delay between them, however if i send an email to 2 different
hotmail.com address and send 3 messages per recipient it does correctly
insert the 310s delay between the recipients messages. However the issue is
its trying to deliver to both recipients at the same time, ie
Emails spooled
Email 1 to both reclipents sent (with the 6 second debug gap)
Wait 310s
Email 2 to both recipients sent (with the 6 second debug gap)
Wait 310s
Email 3 to both recipients sent (with the 6 second debug gap)
Where as i expected it to instead work like:
Emails spooled
Email 1 to recipient 1 sent
Wait 310s
Email 1 to recipient 2 sent
Wait 310s
Email 2 to recipient 1 sent
Etc
How can i adjust the config so that instead of matching the recipients its
matching the domains as if 50 emails go out to hotmail.com at the same time
to different recipients it doesn't try and delvier them all at the same
time.
Best Regards
Matt.
