I get a lot emails with the below in them, i guess one per domain ideas? ispconfig 3.1 ubuntu 16.04 after upgrade from 14.04 31.05.2017-09:18 - WARNING - Falsche Anfrage / Wrong QuerySQL-Query = REPLACE INTO `dns_rr` (`id`,`sys_userid`,`sys_groupid`,`sys_perm_user`,`sys_perm_group`,`sys_perm_other`,`server_id`,`zone`,`name`,`type`,`data`,`aux`,`ttl`,`active`,`stamp`,`serial`) VALUES ('3628','123','122','riud','ru','',7,'128','default._domainkey.icravefreestuff.com.','TXT','v=DKIM1; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzy1goAbhSDWyI7sydc5FDHZPSFN86ufgU2NcXb2HeeyX53esxBhxJ1Jcmgkb0N/fsHIWH+WnzztjcfRWF2Ga3IeXy0e1hi0GcA3yNxRJOC/dlpbknUUVHiTKFlzEZCWnsIBY1tcVF4kjWxpJRA1w7hz5UllmcWopmoAligh+dmCSdej9K4y5U4y7w2xtfuwLdJA/UxmTivfPLHleayEb+VYb2BvhvqUG4FE+cBMGafGVoL3TxzrAycj/BVtkpUXgRBNzjCwfuW1X93UqAsPQIMxLxPCCpMK4/OJ9aPCcmnvZHAVg5qc9zKfLCV7UI9BXxTxiX6WPvyU5sX0wMCeL+wIDAQAB','0','300','Y','2016-12-16 09:41:12','2017053101') -> 1406 (Data too long for column 'data' at row 1)
Change the type of the data column in the dns_rr table on the slave from varchar 255 to txt. ISPConfig has changed the type in one of the 3.0.5.x updates, but maybe this change did not got applied correctly on your DB.
