It doesn’t seem to happen with .eml attachments, and only some .pdf and some .jpg .
Ok testing Mac V10.3.2622 (Sequoia) and the upcoming Mac V10.3.4341 on OS26 (Tahoe), seems to open all .my jpg, .png & pdfs fine in the default Mac Preview program “no matter which way i open them”.
Yes i see a slight flicker for approx a sec “and then the preview program opens” and displays them.
What i would suggest for a test is to eg: “drag the image attachments and pdf attachments (that wont open) out of eM Client” to your Mac desktop which will then make a copy of them.
Then try to open those attachments on your desktop via right click or dblclick and see if they will open “to make sure those attachments are valid”. If they still wont open outside of eM Client then you know its the attachments themselves and might be corrupted in some way.
However “if the attachments will all open ok outside of eM Client on the desktop in the Mac preview app”, then suggest to first make a backup of eM Client via “Menu / File / Backup” incase you need to restore for any reason, and then once backed up “close eM Client” and then go to “Applications” and “drag eM Client to the bin”. That won’t delete the hidden database folder.
Then if your happy to test the upcoming Mac V10.3.4341, go to the below link and install the Mac version which will pickup your existing hidden database and see if that fixes this issue.
- never checked (isn’t it for IMAP users?
Yes Use Server Search if available “i suspect would be more designed for IMAP, Exchange, Office 365 and iCloud accounts” and (when enabled) has been known to sometimes cause issues for some users with eg: slower searching and “not always finding what you are searching for” depending on the specific server etc.
I personally have that currently enabled on my Gmail and other IMAP accounts.