Now that you have defined a reason as to why you are emailing people you need to work out a mail-out frequency and stick to it!
We recommend for commercial emails not to have a weekly mail-out frequency. If you do then be prepared to see your mailing list quickly dry up. Ask yourself if you would like to hear from a business every week.
A fortnightly mail-out frequency is risky but if you have great content that your subscribers love more than their family pet then go for it.
However based on our experience a monthly mail-out frequency is standard and generally the expected norm. This does not let you off the hook in terms of providing great content – that is still very much expected from your subscribers.