Greets I cannot say if this is a 7.5.2 problem or not. All my clients have problems attaching documents bigger than about 5K after a while. If I reboot the server, I can send a 1.5 Mb attachment, no problem. But after a day or so, it will just hang up. I have checked the other threads, done the smtp -> sendmail change and back again, checked all the php.ini max limits and execution, memory limits, etc. Nothing works. Even before I made all those changes, a reboot would solve it. A courier-imap restart doesn't fix it either. Any suggestions? I just did another reboot and now it's working fine again.... for now.