I cannot send emails from my iPhone, getting "No Space Left on Device" error message.

The problem has nothing to do with the email server / pop3 or IMAP / storage space on the phone. It is an iOS glitch that appeared after the software update. Every time this happens you need to restart the phone (or hard reset it) and after that the email sends. In other words you have to keep re-starting your phone to be able to send emails.

This message comes up, this problem has started yesterday. Do I need to set up another outgoing mail server?

A new bug, no more or less. I have hit it 3 times and each time have totally LOST my reply messages entirely. No evidence of sent message and no evidence of receipt by intended recipient either. A pure programming mistake which drops the message after a bogus warning. Apple software quality assurance is dreck....

Try turning off settings-> Apple ID -> iCloud -> “Private Relay” temporarily.

I was getting the same error when sending emails and had plenty of space everywhere. After turning “Private Relay” off and back on the emails sent.

Hello m_rider, did you find a solution to your mail server issue?

I have just updated to IOS 17.1.2 and now I’m getting the same error message that you reported. I’m assuming it’s an Apple bug, or should I say “feature”!

17.1.0 seemed ok.

Cheers, Nick.

I get the same exact message whenever I send out an email. It says "No space left on device". I send email out using the Comcast server. I know the problem is not with Comcast because I can send out emails from my desktop computer when connecting to the same exact SMTP server and never have a problem there. It only occurs on my iPhone. Does anyone else have any ideas? Restarting my iPhone every time I want to send an email is not acceptable.

I’m having the same problem. Has anyone managed to fix this issue? The email get stored on the outbox and it keeps saying “no space on device” when there is plenty

Did you configure mail as pop or imap? Your configuration details are probably wrong, or your server is down. You need to get the configuration settings for your gmail account as imap from google and check what is in your mail settings

mail>Accounts>your email account> tap the email, tap SMTP and check the configuration, go back tap Advanced and check your configuration

This worked for me. Or rather “Private Relay” was actually off, toggled it to on and the emails sent.

Hello m_rider,

Thank you for choosing Apple Community Help, Regarding the issue you're experiencing there's a few things to try.

Sign out and back in: By signing in and out again you can reset the mail system.

Check your mail service storage: If you use Gmail or another mail service I recommend logging into your gmail account on your computer and checking how much storage is left. If you have filled up your storage via your email account then it will give you that error. Most email services offer storage upgrades for low prices.

Hope this helps!

m_rider wrote:

I set up my email accounts nearly a decade ago, so I have no clue how they were set up originally. I have done nothing to change the way they are set up either. This is a sudden issue that I only started encountering in iOS 17. That being said, it looks like IMAP is being used for my incoming settings. There's no information about IMAP vs POP in the SMTP config page.

The easiest way to resolve this sort of mail problem is to delete the account and add it back. That will install fresh settings.

m_rider wrote:

I assume that will delete all the email associated with the account from my phone, correct?

Unless you have an older POP account or you have moved email in an IMAP account to a local only folder, no, you won't. It appears you're using Gmail, which is an IMAP account. Your email is stored on Google's servers.

Try to Force Restart your iPhone first

Force restart iPhone – Apple Support