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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Posted on Nov 9, 2024 11:59 AM

I’ve been getting this error, I found that coming off WiFi and using 5g to update my mail then going back to WiFi clears the error.

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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.

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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!

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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.

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Nov 26, 2024 9:29 PM in response to Minimorum


The POSIX 54 error in Mail when using iCloud Custom Domain appears to be a recurring issue since the 18.0.1 update. After troubleshooting, I've found a solution that resolves the error, restoring full functionality to the Mail app with the iCloud Custom Domain. If you're facing this issue,



[Edited by Moderator]

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POSIX 54 Error in Mail (iCloud Custom Domain)

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