Question: I've noticed that people use present perfect when emailing other people, but I'm not sure how to utilize that verb tense. Will my example below work?

> 
> "To this email, **I've attached** the copies of the photos you **asked** for. Also, because you *told* me that you **didn't** get the other copies, **I've made** more copies for you. **I've also attached** them to this email."
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Or should I use the following?

> 
> "To this email, I *attached* the copies of the photos you **asked** for. Also, because you **told** me that you **didn't** get the other copies, I **made** more copies for you. I also **attached** them to this email."
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Is there a reason why people use present perfect when emailing?

Answer: 
First one seems reasonably good and enough. Though, I believe you can also phrase 1st line as, 

> 
> I have, herewith, attached the copies of the photos you asked for.
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I also don't see the need for the following phrase in the end. 

> 
> I've also attached them to this email.
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Also, it's usually a good practice to make a list of the attached items to the mail in a sequence - and then perhaps add some information in front of them individually as you may see fit. For instance: 

> 
> Please find the following files attached herewith: 
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> 
> 1. *abc.jpg* - As requested by you in the last mail
> 2. *def.jpg*, *ghi.jpg* - Copies of the earlier photos you were not able to receive
> 3. *jkl.jpg*, *mno.jpg*
> 
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Short answer: Use the Past Simple if it's clearer, and it is a bit clearer here, plus is quicker and more common.

Longer answer: The Present Perfect is usually used in three ways.

Life experience (something occurring in the subject's past):

> 
> I've participated in scavenger hunts with members of the Royal Family.  
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>  I've never studied Martian.  
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>  I've tried to, but I only have one larynx. 
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A change or action which affects or relates to the present situation:

> 
> We've sent you the insects you requested. (They're in the mail.)  
> 
>  I've caught a cold. (Now I'm sick.)  
> 
>  My girlfriend has broken my hip. (Now she hops.) 
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An action or state lasting up until now:

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> We've been waiting around all day for that asteroid to hit.  
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>  I've never been good at wrestling ogres. 
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In your example, while all of those Present Perfect verbs are examples of a past action having a result relevant to the matter at hand, it's a little clearer if you use Past Simple because when someone's quickly reading an email the Present Perfect may be less obvious. This is because of potential confusion with the 'life experience'.

If you write '...I've made more copies for you.' it may also be read similar to 'I've made more copies for you at times in the past.' and it's subtly more courteous to the reader to remove the confusion. Past Simple may also refer to the past but the context makes it clear here.

Both tenses are correct in this case and we have a choice of whether we want to speak as though we're emphasizing the events when they happened **or** the present situation created by them, and I prefer the Past Simple for clear communication. If this were literature, I'd probably use the Present Perfect because we really are more concerned with the resulting situation, unless I were trying to evoke a more vernacular feel.