Error : SMTP Error:  5.7.1 Mail seems to be spam and will not be delivered. Please contact support. ID: dd89806e-e1b5-11e8-aa92-005056917658
If you see such an error when attempting to send mails, your e-mail account is in the spam blacklist. In that case, please update the e-mail password to a secure one and contact support via your support ticket system.
This issue is caused by the reputation of the IP address that you are sending e-mails from. When multiple e-mails has been sent from an disreputable IP address (according to Cyren) the e-mail address is blocked for 24 hours, this to prevent hacked accounts from sending spam as that would, in the end, affect all our shared hosting customers.
You can check your IP's reputation here: http://www.cyren.com/security-center/ip-reputation-check