when you email a provider how do you sign? love, sincerely, your truly? do you avoid terms of endearment
Should be a simple, to-the-point introduction and request to meet. I just sign with my name/handle. Polite and respectful, not terms of endearment.
I try to treat the initial email as if I were reserving a hotel room at a first class resort. This is, after all, a business arrangement and should be treated as such. This is who I am, this is how much time I want, this is when I want it and these are my special requests/options. Typically no more than four or five sentences. You do have to do your research - doesn't make much sense to request an ocean view room at a ski resort.... Similarly, don't request GRK from a provider that doesn't offer it.
Generally, my correspondence over time gets friendlier (and occasionally downright smutty depending on the woman.... ). But it starts very businesslike.
After we meet and we're exchanging emails just to say "Hi" then I'll use Love.
Good to see someone who recognizes the importance is communications/pleasantries
You can sign an xoxo 
If someone signed love in an email to me, it wouldn't bother me or anything. I would hate to end up accidentally hurting a guys feelings if he did indeed fall in love from seeing me though lol
About your feelings! IMHO if your really taken or smitten by a lady friend that you have spent several hours with, if the word "like" doesn't totally describe your feelings, I don't have a problem with using words of endearment! Now I realize for some this would not be the "mocho" thing to do, however for me i find it fascinating and rewarding to a LTR.
...begin with "Hi beautiful, Hi gorgeous, Hey goodlookin'. I don't do this until I've seen them a couple of times or more. Most often I begin with their name.
I sign most often with just my first name and my handle. Sometimes I use ltr, ttyl, or l8r then my name.
I don't do the love or luv ya on sign off.
There are some I have known for years and and I would put love in the sign off but that's just one or two ladies.
For initial contact it's strictly Hi (her provider name) and sign off with my first name and handle
like Ro
I usually sign my emails...
Until we meet,
Your devoted Senator
Your Royal Knight Companion of the most Ancient and most noble order of the Thistle, Dani
My favorite closing to an email was from a provider who thanked me for the nice review and signed her email to me:
"I like you. Let's fuck again soon."
then after date #1, whatever seems appropriate for the rapport we had "gorgeous, beautiful, my sexy friend, etc.").
And I often sign off with a simple cordial, "All the Best" - as I do for most of my PMs too.
That actually best reflects the carefree attitude I have toward this hobby and life in general - I'm looking for fun, down-to-earth ladies, if it something works out, then great, if not, then that is fine too - and I really do wish the best for everyone (yeah, kind of hokie, but I'm having too much fun to get caught up in negative drama either in the hobby or life for the most part).
Definitely avoid "love" or such at the end. A friendly vibe is the best to me, as in my mind, the best civvie parallel to a good hobbyst-provider relationship is the the friends-with-benefits situation. And I've got a bunch of sexy "friends" at the moment who I like to spend time with! 
I sign just about everything I send of a personal nature with 'Always' at the end. I always have, no pun intended. It just seems to be very comfortable for me and the recipient, and it's endearing without being creepy.
It doesn't matter how anyone uses terms of endearment. Love, like, xoxo, baby, honey, sweetie, sugar, or wet kisses. This is the place of fake orgasms, fake interest, fake moans, fake reviews, fake pics, and so on. If someone signs love, I'm pretty sure it's fake love. But then, yesterday, got an inbox with a 100 xo sign off. I usually get four to six xos from her, but taking a little extra time to do one hundred was quite touching. In fact, that was way more special than if she'd signed love
The listener is supposed to figure out the degree of like-ness/love-ness from context. We need an all-purpose word like that in English.
I usually sign my email exchanges with repeat friends with the old reliable "xoxo". Works ok without conveying any undesirable implicit message.