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POSIX 54 Error in Mail (iCloud Custom Domain)

Anyone experiencing a POSIX 54 error in Mail (using iCloud Custom Domain)?

Seems to be happening since 18.0.1 update.

iPhone 13 Pro Max, iOS 18

Posted on Oct 30, 2024 9:01 AM

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Question marked as Top-ranking reply

Posted on Oct 31, 2024 11:22 AM

I am so tired of Apple pushing out updates without fully trying them themselves. Now it’s the email not working. Also, since updating, I am having problems texting non-Apple users. I wish I never updated!

23 replies

Nov 2, 2024 6:17 AM in response to Minimorum

Yes, the same thing is happening to me. I see that you're connecting to secure.emailsrvr.com, which is Rackspace. I also use Rackspace. And this just started with ios 18. Happens to both me and my wife. I reject the other replies in this thread. I don't think this has anything to do with iCloud servers since connecting to the Rackspace servers uses SMTP and does not utilize iCloud. Also, this has nothing to do with texting, RCS, or anything else people seem to be bringing up in this thread.


With me, its intermittent. If I ignore the error, eventually I stop getting it and it works fine.


I've reported it to Apple. I'm also going to report it to Rackspace since it may be an issue with one of their SMTP servers. Actually, I suspect this is the most likely scenario.

Nov 4, 2024 9:56 AM in response to javatyger

Having the same issue with iPad OS 18.1


Definitely not happy about this, I hope that Apple fixes this problem soon.


Update: I chatted with a Apple support rep and had me trouble shoot it:

- turned off iCloud email in iCloud settings.

- force restarted iPad

- turned iCloud email back on in settings


Email is now working and the error has disappeared since!

Nov 4, 2024 9:08 PM in response to Minimorum

I bought a new iPad with 18.0.1 a few weeks back, and I just got the POSIX 54 error for the first time today. But I am connecting to my gmail email account, not iCloud or any of the other mail servers also discussed in this thread.

I can still access my gmail via my desktop, Samsung phone, and even on the iPad by using Safari to log into the gmail account. But not working with email account defined on the iPad.

POSIX 54 Error in Mail (iCloud Custom Domain)

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