@ Alan: ISP checked with my mail address added to his mail sending list. I get the capped Log too.
By the way I do have very often an error "SQLite Error 11 - database disk image is malformed." when opening my Log.... (But the Problem with the emails are if there is this error or not...)
@ Glimmstengel: Have you used a full install as you have switched to V5.00.71 or have you used the small update files? If the last is the case it might be neccessary to completely uninstall your current V5 install and use a full V5 install instead. Don't forget to make back-up copies of your .db files.
Maybe you should copy your MyLog.db into another folder or renmae ist to .db.old and start with a new, empty one, to see if the probelm is caused by a corrupted db file.
But as first try you can procede as Alan said: switch to sending through one of your own mail addresses.
Ingo