We arrived at a new milestone in the war on spam. To have a better delivery rate, we incorporated the use of DKIM (DomainKeys Identified Mail) cryptographic signature. It means that every e-mail sent via our SMTP service is digitally signed before being sent out to improve the authenticity of the e-mail. When the e-mail server of the recipient takes over the digitally signed letter, it will accept it more easily; it is less likely that it will consider it as a spam, so it is more certain that your important letter will get to the recipient.  In daily use, it means that for example, the e-mails sent to Gmail.com e-mail addresses will get to their targets in more numbers and in less time because even Google has more trust towards letters signed with DKIM technology. (The DKIM digital signature is placed in the technical header of the e-mail, so it cannot be seen when you read the letter, it has no visual appearance. They are only to comprehend for the e-mail servers of the service providers and only the servers “see” the signature.)