Why won't my iPhone let me send emails?

I have several email accounts on my phone. Two are hotmail. One of them, which is also my iTunes email, will not let me send emails. For a while it would not let me get them, but I deleted the account and re-added it so it now accepts email but will not send them. It keeps telling me my passcode is incorrect, but I've reset the passcode and I've deleted and re added the account. I can receive emails fine but not send them. This has been going on for over a month now and all of my other emails are working fine. I have an iPhone 6. Can anyone please help me? I've already tried deleting and re adding the account (which deleted all my notes and important calendar info btw), resetting my passcode, restarting my phone, switching on and off of Wi-Fi and other things. I can send email from the safari browser and from my computer fine, just not he mail app.

Which parts of my iPhone 5s can I sell?

I have my iPhone 5s that I've taken apart everything's fine Screens not cracked or anything I'm just wondering which parts can I sell off of it and for how much?

IPhone screen vertical lines?

So, my iphone randomly started having striped lines on the screen and it wouldn't work. So I reset the phone by pressing the home button and sleep button at the same time for 10 seconds. It started working but now the same exact thing just happened. What can I do?

Better to buy on app or computer?

I'm trying to buy Justin Bieber tickets on Friday @ 10 (i know its better to do resale but I just can't) I'm going to be in school on Friday in class.
I'm trying to get the cheapest in a specific section.
Would you recommend using the Ticketmaster app on my iPhone or using safari on my phone