Comment to MassMiler - Database error
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I have tried to run that query manualy in phpmyadmin:
DELETE FROM `bx_massmailer_letters` WHERE `campaign_id` IN (4,8)
with success - I just simulated it not exetuted it and it finds all the letters from campaing_id 4 and 8.
I wonder why cronjob at every morning at 2:00 has this problem described above.....