We often say not to use Outlook or any other email client to send your e-mail campaigns. All the e
mail marketing software are specifically created to achieve effective results and the other ordinary email clients don´t .
Anyway, if you use Outlook for that, please, do not use the option "High Importance". When you send all your messages with high priority, they stop being all important; so when messages are really priority, nobody takes it as important. The email can be deleted without open. Dou you remember the fable "The Boy Who Cried Wolf"? It is the same essence.
For example, on September 18th I received an email with "High Importance" asking me to enroll a course whose registration period ended ... on October 5th! I think this time the symbol is dispensable. Don´t you think? If we add that the subject line was written in capital letter, it seemed the announcement of the imminent arrival of a meteorite ;-)
Be careful with this...