E-mail Bounced question

[RC]

I use Netscape 7.2, XP Pro

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax)

I have high speed internet through CableOne.

I have e-mail addresses for CableOne, Ideaone and Prodigy. (Prodigy? Yeah, I been around that long)

Anyway, these addresses have been working for years. Lately as in the last several months, I have been getting e-mails I send using Ideaone randomly bounced back as undeliverable. Never mind I hit Reply. Never mind messages a few minutes before and after go through. Never mind they are sent to various different e-mail providers.

When trying to deliver your message, the mail server at S3.cableone.net encountered
problems with the following addresses.

For <[e-mail]>, Gave up after 56 hours, last error: recent slow open age=63 delay=189 399 TCP Read failed (Connecti

Or

When trying to deliver your message, the mail server at S4.cableone.net encountered
problems with the following addresses.

For <[e-mail]>, Open Error 0sec (550 Access denied...2b4de9b1b15129e10d6da46db41d94546d21250130edc4d189c45d8945215d195d...)

I suspect CableOne. All internet problems I've had in the past have been because of CableOne, even when they deny it. They apparently don't want to deal with this because I don't use Outlook.

Any ideas before I tangle with their techs again?