Okay, so first of all, let me confess that I am not a server admin and pretty novice when it comes to configuring mail servers and everything and that's why I have come here looking for some help, I'd really need some hand holding but I am willing to learn We are running a mail server on QMAIL and have found that several emails sent through email blasts are completely going missing, they are not being delivered either to the inboxes or to the SPAM, they just vanish. This is our current QMAIL settings I looked up the QMAIL log and found several entries like So I am guessing this has to do something with those missing emails. We are on an unmanaged VPS, so I am not getting much help from the server admins anyways. Please look into it and advise what's wrong and how to get it fixed. Again, I am extremely novice at all this, so please pardon me if and when I ask dumb questions, I am really trying to learn all this. Thanks a ton in advance EDIT: Another thing worth mentioning here is that I've found our server sending emails too fast, yes that's right, too fast. I mean it sends off like 600,000 emails in about 16 hrs. So is the high sending rate a probable reason for the above issue and if yes, then how can I slow it down. Thanks again!