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I'm transitioning mailing of a sizeable number of mails (maybe 1m/day) to another host. I want to warm up the new host gradually over a month rather than suddenly start sending through it and appear to be a spammer.

Is there any way to tell exim to smarthost only a fraction of the emails? That way I could start off smarthosting through my old host, and gradually ramp up the mail that goes out directly from the new host.

Edward Hibbert
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    You could use a DNS name for the smarthost and add 9 A records for the old IP and 1 A record for the new IP for a 9/1 split of the load. Then gradually change the number of A records of each. – wurtel Nov 12 '15 at 12:45
  • Sneaky. I hadn't thought of that, and I like it. – Edward Hibbert Nov 12 '15 at 13:07
  • Exim have variables that can be tested during routing. Say, you assign some random value to the acl_m_prob variable and then if it lower than threshold, submit it via new_smarthost, and via old_smarthost else. – Kondybas Nov 12 '15 at 13:40
  • That's the kind of thing I'd want to do, but it would be useful to have an example config. – Edward Hibbert Nov 12 '15 at 14:05

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