When it comes to outdated Copyright info on websites, I’m a bit of a stickler. That little © Copyright notice at the bottom of your website may not be something you pay much attention to. But at least once a year you should. Often it’s an oversight. However, an outdated copyright on your website can be perceived or reflect business services and products which are old or outdated.
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Is that the message you want to convey to potential customers?
Think of it this way:
“When the decision to stay or navigate away is made in a few seconds, perception is everything.”
Whether for business or personal, email remains a primary mode of communication. However, email etiquette very often goes out the window in our informal world. 
I once received an email from an aunt which was written entirely in CAPITAL letters. I replied and asked why she was SHOUTING!?
Postcards may seem like a thing of the past given our digital landscape. However, inboxes are now inundated and filled with marketing emails which can average over 120 per day if not more.