I am having the same problem it looks like with sending mails to comcast, rcn, and adelphia.
Sort of a big issue for me
The problem with comcast has been going on for about 10 days. But, hey, you didn't really need to send any emails to any of comcast's 15 million customers did you?
Unfortunately, this is indicative of major issues within LP. The fact that several major ISP's have been blocking all email from LP mail servers for over a week indicates that LP mail servers have been sending out heavy volumes of spam...the fact that LP tech support seems unable to control this problem is very worrying (and, annoying).
I've been with LP for over 5 years, and recommended them to friends and colleagues. But, the last month of "upgrades" has been a complete fiasco, from my perspective. I've been buried in spam, because SpamAssassin is still not running on quasor, and I've had to use my ISP's mail servers to send emails to many of my customers (whose ISP's are blocking mail from LP).
If it was just an issue of a few hours, or even a day or two, I would be more understanding. But, these problems have been going on for days and weeks...clearly, there appear to be major problems with LP management and tech support. It's a shame, because 5 years ago they were great.