QR Codes need to be mobile friendly and offer incentive.
From AdAge – the article is good, but the conversation [...]
The importance of a good headshot
If you are ever asked to speak and don't have a headshot you provide in high res, it is almost guaranteed that the people posting the information will turn to the online photo resource, "GOOGLE" to find what they can of you. It may not even be you, it may of you dancing on tables.
Did you tell everyone you changed your MX and IP?
If you've changed your DNS information, IP addresses, MX records it could affect these things. If you've moved your website, functions may not be set up as they were with the previous hosting company. Are you suddenly getting less mail? Fewer contact forms? A simple lack of communication may be the root of the problem.