cannot send mail message/user name or password is incorrect

Thank you for that. It was driving me crazy and I couldn't work out what I was doing wrong

Thank you thank you thank you! I use my iphone for emails way too much and it was super frustrating,

Hey jdp6000

Bet you did not think in 2013 this post would still be helpful? IT IS and was very helpful.

Solved my issue on my new iPhone w/o the bs of calling my cable provider.

Cured my problem, thank you.

Thank you this Help so glad i was stressing awesome 🙂

Wanda

Thank you for sharing this. I've had this happen many times on my devices and have always resorted to deleting and recreating the account - until I found your solution.

TThanks so much. It works.

Thank you for the solution. I have two e-mails on my I Phone and I have been living with the problem of getting incoming on both addresses but only able to send out on AOL.

I've been studying this problem for quite a while now. Frankly, most of these answers are clearly wrong, and misunderstand the issue.

This problem has nothing to do with your iOS version, restore, settings, username, or password being incorrect unless you were never able to send email at all. I have experienced it on 4,5s, and iPhone 6, with many different iOS versions and it is never fixed by an upgrade.

Basically, If you were sending email ok an hour ago, haven't done an upgrade or restore or changed any settings, and it's suddenly stopped working, there is no need to change any settings, delete accounts, etc.

This problem has something to do with switching cell towers, routers, locations, protocol paths, etc. if I drive across town, fly on a plane, etc. I often notice email will no longer send until I do a two finger reset. Sometimes switching to wifi, or switching off wifi if you've been using it and moving the email sends to the lte cellular network , will fix it as well.

Photos or other attachments will often be the emails that won't send, while short texts only will still work. It seems once there has been a failure to send one, no others will go through indicating the router or cell tower is remembering the failure, and refusing to try again. Poor signal, or switching towers while in the middle of sending may cause it as well.

If the two finger reset, isn't working, try turning off wifi to force using the cell network will work. Other times the cell network may be getting too many errors on your large attachment and moving to a location with good wifi will work. Once it fails once, simply getting a better signal isn't enough unless you use one of these other methods to force it to forget the previous error an actually try again instead of just pretending to do so Seems to be required.

Sometimes resetting, and immediately trying again still won't work, while resetting and waiting a while before trying again, will. Again indicating the network is remembering the error.

Somebody who actually knows at a cellular company or Apple, please explain the technicalities. The rest of you are just spreading folklore, or coincidental fixes, imho.

Thank you so much - changed my password on my IMac and have been unable to send from iPhone ever since. This fixed it 🙂

Thank you for this. I have been having trouble sending email from my iPhone for a couple of weeks now. I can receive but not send. This worked perfectly! Thank you again.

Thank you! That was the problem. I changed my password on my computer and did change the incoming but not the outgoing. Totally helpful!

Thanks. Yours is the advice that worked... Star!

Thanks, the first piece of advise that actually worked. Thank you so much

Thanks so much also - had the same problem that's had me stumped for hours now all working

This saved me from a lot of extra trouble! Thank you!