Caveat however; sending unsolicited e-mail marketing messages (spamming) should be strictly avoided to prevent penal action (including possible shut mailing list down of the site) by Internet administrators. The way out of this problem is the 'Opt-in' e-mail list; a list (there are various ways of developing such a list) of recipients who have consented to receive promotional e-mail messages.
When implemented on a large scale (the usual prerequisite for success), it becomes very difficult for individuals and small mailing list companies (and some large companies without designated resources, for that matter) to initiate and run an effective e-mail marketing programme without the help of professional 'E-Mail Marketing Services' providers.
E-Mail Marketing Services' providers are specialized companies that provide professional assistance (mostly on very competitive price terms) in creating, implementing and monitoring effective bulk e-mail marketing campaigns. These services may include, depending on the scope of work entrusted, designing the e-mail campaign (including creation of the marketing messages).