Problem to send mail attachment in Mail client on Mac OS Tahoe after update 26.0.1

When I add a file, for example a 300k PDF, the text "Downloading" appears below it, and when I send the email, the file remains unsent.



When I use web-based email, everything is normal.

THe problem is in Mail client. Help.


[Edited by Moderator]

Mac mini (M4)

Posted on Sep 30, 2025 4:37 AM

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Posted on Oct 20, 2025 5:35 AM

Deleting this one preference file "com.apple.mail.plist" fixes it. But how long that will last who knows and what is causing it to become corrupted. 


Here is the path to that file /Users/~/Library/Containers/com.apple.mail/Data/Library/Preferences

10 replies

Oct 28, 2025 3:53 AM in response to DYP`

Testing here with an open New Message window. I have files attached that came from the Documents, Downloads or Applications folder. But trying to attach files from any other folder will not work or trying to create an email from QB or LR for example will not attach the files even though it will open a New Message window.

Oct 20, 2025 3:22 AM in response to DYP`

After deleting some preference files, Mail was allowing me to attach files and then this morning it won't allow me to attach files again. I changed nothing. This is a total mess. 


Possibility a conflict with Quickbooks. The problem, I first noticed again, showed up yesterday after I tried to send any email from Quickbooks.

Oct 27, 2025 1:44 PM in response to Asen Petrov

Back again so now deleting "com.apple.mail.plist" does not fix it. I went to download 26.0.1 to start a clean install on a new partition (Volumn) and it did not stop and ask and went ahead and up dated without my permission. That is BS.


Anyway I am now running 20.0.1 and had no problems with mail for over a week then suddenly it is back. Last time I sent an attachment was on the 24th. Nothing changed since then. Needless to say I am highly ****** at this.

Problem to send mail attachment in Mail client on Mac OS Tahoe after update 26.0.1

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