It really depends on the situation. If it's something that I need a lot of support on, I will either send an email to the entire ETL/TL team, or I will send it to just the ETLs. If I need to remind ETLs to do the PFresh walk, banana receiving, acknowledging and using the push app for FDC deliveries, etc. I will usually send an email to the entire exec team. If I need to clarify scheduling stuff then I will send it to my ETL or the hardlines schedule writer and then cc the other one and my ETL HR and STL. If the email is regarding a request that I feel I might get pushback on, then I will email it to whoever I need help from and I cc my ETL and possibly my STL. It really just depends on the situation.
I use a generic salutation if I'm sending the email to more than one person (not including cc or bcc). I personalize the salutation if it's to one person (again, not including cc or bcc).
I like to use email to keep all pertinent parties clued in to what I'm working on, situations I'm dealing with, and any other strategies that they need to know. I work almost opposite of my ETL and I'm closing more than opening most weeks this semester. Email is vital to my communication and partnerships in the store.