I was poking around at some DNS this weekend and happened to do a MX lookup for mail.com and noticed something changed. Previously mail.com mail was handled by Outblaze (now owned by IBM). It seems, though, that mail.com is now outsourcing their mail delivery to AOL.
Valeria:~ laura$ host mail.com
mail.com has address 18.104.22.168
mail.com mail is handled by 10 mtain-mmc.gmtain-mmc.mx.aol.com.
This means mail.com is no longer affected by the aggressive blocking at Outblaze. Senders may see an change in delivery to mail.com addresses over the short term.