[M T]

Apparently, I'm so prolific with PMs my allotted space is almost gone. I can easily delete messages I've received, however, I'm unable to delete messages I've sent. Use the same methodology, click the box next to the message, click the delete button. The former delete, but not the latter. Any thoughts? Using the latest version of Safari. . . .

I was able to delete a message from my Sent Items by your method.   I was able to do it with both Safari and Firefox on a Mac.

BUT NOTE: Deleting a message moves it to your Trash Can. To get rid of the space used by the message, you need to delete it out of the Trash Can.

[M T]

Apparently, I'm so prolific with PMs my allotted space is almost gone. I can easily delete messages I've received, however, I'm unable to delete messages I've sent. Use the same methodology, click the box next to the message, click the delete button. The former delete, but not the latter. Any thoughts? Using the latest version of Safari. . . .

I was able to delete a message from my Sent Items by your method.   I was able to do it with both Safari and Firefox on a Mac.

BUT NOTE: Deleting a message moves it to your Trash Can. To get rid of the space used by the message, you need to delete it out of the Trash Can.