In general, once all issues have been addressed (fixed), reputation recovery can take anywhere from a few hours to just over one week to improve, depending on the specifics of the situation, and how much email volume the IP sends. Complaint ratios determine the amount of risk for receiving mail from an IP, so logically, reputation improves as the ratio of legitimate mails increases with respect to the number of complaints. Speeding up the process is not really possible. SenderBase Reputation is an automated system in which the Senderbase support team has very little manual influence.

 

In the meantime, if there are recipients whom you cannot contact, I would recommend contacting the ISP involved to request temporary whitelisting or you can always arrange to contact the recipient via alternative means.

 

Going forward to prevent compromised accounts from sending spam out of your server, you should set up throttling in SmarterMail and also, like Roman suggested above, use Declude Hijack. It is a free program which we offer on our website at the following link: http://mailsbestfriend.com/downloads. If you have any questions about how to set it up, you can ask here or feel free to contact me directly at the email address in my signature. Thanks.