No, I think whitelisting the accounts ended up working fine.
The slowdown we thought was coming from the connection between Magic Spam and us was internal and has been resolved.

Thanks.

We're new at MagicSpam, and everything looks good so far. Sending out normal mails are taking a few extra minutes as they go out, which isn't all too surprising, but that's offset by the lack of spam incoming, a huge blessing. Question: Our server has several (double opt-in) mailing lists, all run w...