bad RSA signature

DKIM Signature

Message contains this DKIM Signature: DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mail.oktick.com; s=2017; t=1499667304; bh=VFhsvDyyWaAVBkCJUsQ/7DhXwrJVwc4kKfzGwrfx1Bc=; h=To:Subject:MIME-Version:Content-type:From:Message-Id:Date; b=BS48QKeAgqGwN2Smx0Gf60D+rEn4QRgBWvMFTemliN/Nh1XVr9/HllPZqTVRjDjCN m6SxWlMv/AnqvCqDxbIFTKYrYQH9i9PVslZ7P/blO4jpeW/LrUCHocwlIHk17xUd8h hWTAOFtTiJVSLKiBZ+0iKJozViJsKgeDTfpI7+tA=

Signature Information: v= Version: 1 a= Algorithm: rsa-sha256 c= Method: simple/simple d= Domain: mail.oktick.com s= Selector: 2017 q= Protocol:
bh= VFhsvDyyWaAVBkCJUsQ/7DhXwrJVwc4kKfzGwrfx1Bc= h= Signed Headers: To:Subject:MIME-Version:Content-type:From:Message-Id:Date b= Data: BS48QKeAgqGwN2Smx0Gf60D+rEn4QRgBWvMFTemliN/Nh1XVr9/HllPZqTVRjDjCN m6SxWlMv/AnqvCqDxbIFTKYrYQH9i9PVslZ7P/blO4jpeW/LrUCHocwlIHk17xUd8h hWTAOFtTiJVSLKiBZ+0iKJozViJsKgeDTfpI7+tA= Public Key DNS Lookup

Building DNS Query for 2017._domainkey.mail.oktick.com Retrieved this publickey from DNS: v=DKIM1;k=rsa; t=s;n=core;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC/fV51ZgTQ7kv4+9W7094N14vFwV5UZzbS+GboB4VaVTjWKhcBj+DpNTkU7D3ovaHRgWLMuX3lZFZiL6zkPrNbpbig8mgAfhmg8JLC12fO4VBUCwJcrERGwhbi0gMpQFnVHXwVpC7tfTXQDpN+uWLLo5ZCi73rGrDwLc4hlOt+xwIDAQAB Validating Signature

result = fail Details: bad RSA signature