Contacting journalists is one of the most important parts as it presents your level of professionalism. Email sent to journalists should be accurate and persuasive and better sent from founder/CEO. Reporters should be contacted in advance.
In order to create a positive impression, letters should be more "personal" than "spammy" and try to appeal to individual rather than to a machine. Reporters will not take a press release, if they do not find a ambition of moving forward. In order to become "that" company they will write about, just formality is not interesting. Moreover, the response rate of emails is higher if they were sent from founder's email. In order to receive kind of "personalizing" you can mention you hope to see him/her at some event in his/her city.
An email, which can be used as example, includes greetings, introducing yourself and company, proposing the story, telling a short description of a company or product, thanks for taken time and contact information. Concerning the time, it is better to contact reporters the week before, in the morning. After publishing press release it is important to keep in touch and express your gratuity in "follow up" emails. These cover greetings, introducing yourself, words of gratuity, importance of the published press release and desire to work together in the future.
Moreover, you can choose a LinkedIn message. Its content is the same as previous one. After sending email it is worthy to have a look at contact information of technology reporters and collect it for future purposes.