Rich - I checked your settings - no problems I can see.

You might be a victim of some inter-ISP conflicts going on. Too much spam or other suspicious goings-on from a particular ISP - not necessarily from you specific email account - might trigger other ISPs to stop or delay emails. Happens from time to time with my email addresses. Sometimes it takes 12 hours or more for an email to show up when they usually pop up in less than a minute. The ways of ISPs are strange and wondrous.

Jer