Problems with DKIM when sending emails from Joomla Registration Form

Problems with DKIM when sending emails from Joomla Registration Form

Hi, i have configured DKIM for my domain today.
When sending emails from my zoho inbox everything is OK, even when sending through Mac Mail app, but when sending emails from my registration form in joomla and testing with "mail-tester" i get the following error:

your email DKIM signature is:

	v=1;
	a=rsa-sha256;
	q=dns/txt;
	c=relaxed/relaxed;
	t=1461334326;
	s=zoho;
	d=directorioenlinea.mx;
	i=admin@directorioenlinea.mx;
	h=Date:To:From:Subject:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding;
	l=550;
	bh=pC9TIA12BQ7c+9zKKM4w+u5l1uJEhAIxvbLBiPRO1Fw=;
	b=pmSCYVV5HYSaS17UF87OiBtc2X78abe1YTZWOnob3QRig5n/Hhgzunm2gvPrfmZZBczgswzs8Q4qYTiyukH6DxCsHeUVgtzDq907BnQ/mC+fwY7WAeDTaJC5vAEJbNzgYByJ4XRVppQjfHbnaasmTiITnz6inQLtjhwkuQEOGo4=

Your public key is:

"v=DKIM1;
k=rsa;
p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnkyY2oLJuAI35AOmE3NES4VB7WVg2ZDOixnxKfloFvbiblqBhv0pYNom2zne8/CwwQcBCEz8LrtUKnrj+nz3GRHgObM2GBBlEtpmoiIRak5pkU7Yj8jBZj7n0ssbGXYgWtCCqz8NCfCw8fxViFv6XNKMGTmFjmne/JQaG8+3w+wIDAQAB"

Your key length: 1024bits

Your DKIM signature is not valid