I've been receiving their emails with no problems. I also run my own mail server.
I would suggest that they set up a message board like phpBB for announcements rather than use a mailing list. But that's just my opinion. Actually, some BB software will send an Email out to a mailing list after a message is posted. So all they would have to do is post a message to their announcement forum and an email is automatically sent out to everyone on their mailing list.
The benefit is that users who didn't get the Email could still read the announcements on their website's forum.
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