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Sorry for the late reply but Ive been swamped with work recently. First and foremost, It was a pleasure meeting you! We had a very efficient discussion followed by a wonderful tour of your factory! Leo and Tina were very helpful, creatively thinking on how we should proceed with the bracket design during their luxy visit. Of course three heads is definitely better than one(mine)!! Once again, very nice meeting y'all and we'll see each soon in the near future. Thank you.
Comments  
Hi,

Here's what I suggest.

Sorry for the late reply, but Ive been swamped with work recently. First and foremost, it was a pleasure meeting you! We had a very useful discussion followed by a wonderful tour of your factory! Leo and Tina were very helpful, creatively thinking about how we should proceed with the bracket design during their next (???) visit. Of course, three heads are definitely better than one(mine)!! Once again, very nice meeting you all and we'll see each other in the near future. Thank you.

Here's a bit of advice from Canada.

Don't write y'all unless you want to sound like a Southern belle, or unless you are making some kind of private joke. It's one of those regional things that are best left to the natives of that region.

Clive
I will also add that it is far too casual for business correspondence unless you are a very close friend of the recipient. In any other case, it will seem facetious.
Students: Are you brave enough to let our tutors analyse your pronunciation?
Hello,

Can someone please correct it, so that it's more professional? Thank you.
Clive has already given you a number of suggestions, and I have added my comment. Now how about putting some thought into it and trying to improve it yourself first? If it is business correspondence, be less casual.
MM,

What do you mean by less casual though?
Students: We have free audio pronunciation exercises.
More formal.