Error in downloading mail on IMAP after ios 18 upgrade

So 18.2 does nothing to fix the issue except it no longer shows the error messages thus tricking you into thinking it's fixed but the problem remains the same. Fired up my Mac just now to have 10 emails instantly come though yet nothing showing on my phone.

We iPhone users can’t run a business or our lives if IOS 18 throws a POSIX 50 error message up related to email service and the only thing the end user can do to run their business/lives is sit with a smart phone that cannot communicate because of POSIX 50. Email is vital, crucial, decisive, fundamental, imperative, important, indispensable to daily communication.

I’m having the same problem, and it just started today. This is on my iPhone SE, running iOS 18.2 for the past few days. At the moment this is affecting only one of my email accounts (knock on wood), and I have several using the same mail server. It’s odd to me that this is just now occurring days after upgrading the iOS, and just weird it’s affecting one mail account.

I think that Apple is focusing so much on making the aesthetics of the user interface so cutesy-poo, that they’ve simply neglected to ensure that the functionality is actually working consistently. After reading through this thread I am both surprised and not, that this has been a known issue for months, and that Apple has apparently not given a single f*** about fixing it. It seems, to me anyhow, that their coders are suffering from the dreaded ID10T error. Either that, or this is part of the SKYNET takeover.

I have 4 imap accounts on the same server, only one account is having issues with zero resolution. Exact settings at the other 3 domains that work on the iPhone. Desktop is fine, iPhone fails and forced to use webmail. Not great when you are expecting communication alerts.

When I delete the account in question and re-ad it, I get mail for a moment, but not all of them and then after roughly 15 min, it defaults to failing to connect with the -9,808 message.

Apple, please shed light on this.

I have read through all 16 pages of this thread and methodically tried EVERY SINGLE answer and proposed solution.

Nothing works.

iOS 18.2. currently.

Problem began the instant I upgraded to iOS 18.

Customer service doesn’t exist in the modern world. I guess we’re all supposed to switch to Gmail.

this may be true for you and your specific mail account but this is not the core issue people are seeing here - the several account I have been troubleshooting with on different servers and devices do not have special characters in the password.

this is definitely a bug in iOS 18 and i dont think any kind of voodoo on the iOS settings is going to fully resolve without a patch from Apple.

Did fastmail tell you what technically they did? No one else has a workable solution. Some of us support our own mail serves - though perhaps rare.... would be great if you could get them to tell you exactly what they did for IMAP solution.

I'm surprised by this--I believe I still had the problem when off the local wifi network. Your PiHole conclusion was interesting to me, because I have PiHole on my local network. I'd like to test this to confirm the fix, but Fastmail has already solved my issue. How to test otherwise?

Regarding missing mail in subfolders, I have found a solution.

It's a strange user interface change.

See my thread here.

I have not seen the POSIX errors in a while either. They seemingly went away, as I did no changes to my dovecot server, did not stop/start using a vpn. It was happening on wifi or cellular. But now it is not happening at all.

At least here, pi-hole was not a factor. "add BLOCK_ICLOUD_PR=false to /etc/pihole/pihole-FTL.conf and restart pihole-FTL (sudo service pihole-FTL restart)." I did that years ago, it's still set the same way.

WHY is this still happening? I still have a posix problem which is blighting my email and no solution offered. Just not acceptable Apple. Please offer some answers to all the messengers on this site. Disrespectful to say the least. And it's December 28 2024....

I have that problem on an iPhone 14 Pro, but my wife hasn´t on her iPhone 12 Pro Max. Exactly same configuration but nevertheless it´s only me who having the problem. Same internet, same Icloud, same everything.... I am so confused.

@cube_23 - if there's any chance you could ask your mail/server provider to specify how they got in contact with Apple Support to make the necessary server-side mail fixes, some of us would be most grateful. I doubt your provider just called 1-800-MY-APPLE. Did they use an Enterprise Support call, or Apple Business? Would be grateful to know how to avoid going in circles.

I am wondering how many email servers that Apple users use are running without without encryption. It seems that it is a huge problem in the industry as per this article (Over three million POP3 and IMAP mail servers without TLS encryption) and switching them over to encryption will cause nothing but headaches going forward for end users on iPhones, iPads and Mac's.

good luck with that - iOS 17 isnt signed anymore. your syntax is 100%? the line in my config is:

imap_capability = IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE XAPPLEPUSHSERVICE AUTH=CRAM-MD5 AUTH=PLAIN AUTH=LOGIN

you can also check what yours looks like by running `doveconf -a | grep imap_capability`

Well I had no luck with going back to 17. Apple absolutely doesn't let you go back. I even tried from a backed up .ipsw file (how frustrating).

Yes, I tried this exact string, `dovecat reload`, then `netcat <ip> 143` and confirmed the string was right.

What version of dovecot are you on?