For each of my email accounts the "check for new messages at startup" checkbox is enabled. One account I added about 5 years ago never got checked at startup, but was always checked at the time interval I specified. I have recently added 3 new accounts and deleted most of the original ones except for one of them. The remaining old account does get checked at startup. All 3 of the new ones do not, but are checked at the specified time interval. How can I fix this problem?