Abstract: Methods and systems to find connections among subscribers to a particular electronic mail (email) newsletter. A list of email addresses to an email campaign is representative of the subscribers to email newsletters that are sent as part of the campaign by a source. A subscriber to a particular email newsletter may receive email newsletter from other sources. A determination is made as to what other email newsletters of each subscribers of the source receive from other sources. The other email newsletters of each subscriber on the list of email addresses of a source are compared to the other subscribers on the list of email addresses. Email newsletters common to subscribers on the list of email addresses are noted. The connections between/among subscribers on the list of email addresses is determined. The weight of a connection may be determined. The connection information may be provided as a service to the source.

Abstract: Methods and systems for predicting a proposed electronic mail (email) for an email campaign to be sent to a list of email addresses received from a sender is spam. A hard bounce rate is predicted for the list of email addresses based on hard bounce rates calculated for respective email addresses on the list. If predicted hard bounce rate exceeds a threshold, the proposed email is deemed spam and sender may be informed. If predicted hard bounce rate falls within range of the threshold, proposed email may be sent to less than all the email addresses on list. If an acceptable number of the sent emails are received, the email may be sent to remaining email addresses on list. Prior to sending proposed email, the list of email addresses may be compared to purchased lists of email addresses. If there is a match, the proposed email may be deemed spam.