Not really. Email addresses that belong to an "opt in" list have opted to receive emails from, say, the list-purchasing company -- not your company. Even if the opt-in process includes language like, "Opt in to receive information from us, or offers from other companies we think you might enjoy," the fact is the recipient doesn't recall having a prior relationship with you, specifically. This makes it highly likely for the recipients to mark you as "spam" when you arrive in their inboxes. Hey, if they don't recognize you or remember opting in to communications from you ... can you blame them?
Email marketing has always been Permission based, but is silently replaced with its brother; Tease Marketing, continuously building on a brand relationship based on mutual interest. The challenge becomes presenting an – already in itself – appealing and attractive message. But how to benchmark your email marketing efforts to fit that new train of thought?
Electronic mailing list servers may be set to forward messages to subscribers of a particular mailing list either individually as they are received by the list server, or in digest form in which all messages received on a particular day by the list server are combined into one email that is sent once per day to subscribers. Some mailing lists allow individual subscribers to decide how they prefer to receive messages from the list server (individual or digest).
If someone didn't ask to hear from you yet, it doesn't mean they won't want to hear from you later. It's your job to prove to them -- through helpful content and valuable offers -- that they should stay up to date with your company via email. If you force your email content on anyone too early, even if you know in your bones they're a great fit for your products or services, you risk preemptively losing their trust and their future business.
Keep the subject line and pre-header short: The subject line is crucial. Keep it short so the reader knows exactly what the email topic is about. And the pre-header text (also known as snippet text), don’t let it go to waste by using “To view this email in your browser…”. Instead, summarize the email or include a call to action (i.e., Use “FREESHIP” to get free shipping).