not acknowledging, answering emails...

I work for a bank and for whatever reason there are some free email systems that I never get the email from the person, so I think I would give him the benefit of the doubt.

But my question to you is, if you sent something as important as your son's resume and wanted him to look at it, why would you not give a follow up call? Obviously you are friends enough to send the resume and have him look at it, why not call a week later and say "I sent you my son's resume last week and I just wanted to make sure you got it, I know you are busy so when ever you get to it; that would be great.

I agree with your wife, you are holding a grudge over something you are not even sure the guy even got and you are pizzed at him and didint even call to check receipt that he even got it.

childish

I agree with the others--you have no idea if he actually received the email. We have a pretty agressive spam filter at my work that eats legit email frequently. I'm assuming the resume was an attachment. Attachments get filtered sometimes. Plus the word "resume" might trigger the filter as well.

Go to the wedding. He's a long time friend and he thought of you when sending out invites. And weddings are fun--go.

I agree, I think you need to step back and look at the situation with less emotion. 

You barely know the guy currently but you went ahead and sent him the resume of a friend's son.   Did you talk to him about that before hand?  I would never, out of the blue, send a resume off to someone I barely speak to without picking up the phone first.  You put him in a potentially precarious position because if he forwards it on and the hire goes bad it can reflect poorly on him.  And that's assuming he got it which as others mentioned isn't a guarantee even if you do have the email address correct.  Just because he doesn't get a lot of emails (your presumption, not a fact) doesn't mean he isn't busy.  You don't know what his schedule and work day really looks like but if he has a big job at a huge bank I'm guessing it's pretty hectic. 

If I were in the position I would keep the wedding issue and this issue separate.  So you don't want to go to the wedding then don't.  Don't make excuses just RSVP no.  But don't make it because he didn't respond to the email. 

If the email situation really bothers you call  him, tell him that so and so's son is still looking and since you hadn't heard back regarding the email you sent you thought you'd give Mell a call then as if Mel recommend any ideas on how to get a foot in the door either at his bank or elsewhere.  

Good advice...  go  to the wedding.  Life long friends, even if not close friends, should trump the other stuff...

I would separate the two from each other this isn't a game where the guy with the most green stamps wins. 
Weddings are fun, you get dressed up, someone else pays for the food, you bring a gift and all is well and happy.  If it's a big wedding there will be other random people around and you can always talk to them.  Ultimately, I'd leave it to my wife, if she wanted to go then yes, otherwise beach.

The resume thing, sending resumes through email and not getting a response is more or less par for the course.  It’s too late to worry about it now all you can do is write the friendship off or move on, but next time I'd suggest a follow up with something a little more definitive then an email.

Either go to the wedding and forget about the e-mail, or don't go and forget about the e-mail.

The e-mail is NBD, there's probably a good chance that he's annoyed at you for sending him an e-mail for the son of a friend (who is a complete stranger to him?). If he can let it go, so shold you.