Keeping an eye on your analytics will help you measure your campaign's performance, so you can refine future efforts to align even more closely. There may be changes you can make that will increase engagement in ways that complement your email marketing strategy.
This is an exceptionally difficult question to answer because basically, the answer is it depends. Your email strategy will have specific goals that contribute towards the goal of your business, which means your campaigns will also have individual goals themselves.
Not every campaign will have the same goal. One campaign may have the goal of driving subscribers, while the next may be to gather customer feedback. After that, you may want to re-engage old customers before launching a new product or service.
While you may have a lot to say, it’s also important that you don’t flood your customers’ inboxes. The last thing you want to do is see your unsubscribe rate tick up, so it’s about sending the right emails to the right customers at the right time. That means segmenting your customers and only sending the most relevant, personalised emails. By doing this, it could mean that many of your customers don’t receive an email from you at all, and that’s ok – if you have nothing to say that’s relevant to them, then save contacting them for when you do.