It is not only "good practice", but it is also a legal requirement in many countries to email only to those addresses that have been verified by the email address Email Database owner. The use of auto-responder services makes this task more manageable. Don't Be A "Promo-Bot" If you want your readership to welcome your messages, open Email Database them and read them every time, you must establish yourself as a giver. Make sure you are always giving more than what you expect in return. Give huge amounts of content and don't expect them to buy something every time you send them an email.
People always buy when value exceeds price, so make Email Database sure your emails always have lots of value and the money will follow. Be Consistent It doesn't matter if you email once a day or once a month, the key is to be consistent. If you email people Email Database every day and you give them the option to unsubscribe in every email, the ones that stay subscribed expect that daily email. They look forward to it. If all of a sudden you skip a day or a Email Database week, they might feel forgotten, neglected or betrayed. The same principle applies when you email out only once a month, you can't all of a sudden blast them with daily emails; they are just not used to it.
I don't just build a list of people and then send Email Database out emails that try to sell them things. And I know everyone once in a while I get an email from someone on my list who is just like "I wish you'd stop try to sell me something", and frankly, my Email Database feeling is that if somebody is responding like that, they probably aren't reading everything I send, because they're missing the fact hat I'm really looking to meet needs, I'm looking to meet their needs, but they're just seeing sales page after sales page. That's all they're seeing. They're not really reading my emails.