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Since two days I cannot upload pictures to the media library anymore. It gives me the post processing error: Post-processing of the image failed. If this is a photo or a large image, please scale it down to 2500 pixels and upload it again.
I am in WordPress 5.5.1 and the image is very small. If I deactivate wp mail smtp plugin the picture uploads just fine.
There are no errors in the log.
Can you help me?