Thanking the recipient for his/her last previous message or favor is important and common etiquette as it shows politeness and appreciation.
After thanking the recipient, you can transition from the previous conversation to new important matters that they need to know by using "I'd like to provide further information regarding…".
Use this expression to bring up a previous conversation that you want to touch upon with the recipient.
Again, this is a useful transition from previous conversations to a current one with new information.
This is an expression that is used to let the reader know that he or she should pay attention to a following detail or information.
Using "pleased to let you know" usually means that you are bringing good or desirable news to the recipient.
These phrases will direct the reader to your attached documents in the email that contains further information.
These three phrases are very important when making requests as they show courteousness and gratefulness (especially the third one).
These expressions are used to politely invite the recipient to contribute in an alternative method if you deem their original contributions unhelpful.
Again, thanking the recipient for any favors, messages, or future help is common courtesy and helps maintain a good relationship between the sender and recipient.
Use this expression to close an email if you want to hear back from the recipient in the form of feedback or further information (depending on what you requested), while simultaneously thanking him or her.
This assures the recipient that you are going to analyse the information given to you and will give them a reply in the near future.