We have one business which relies on advertisement campaigns, one of which involves sending out promotional emails.
Now the recipients of these emails are carefully chosen to ensure that they would be genuinly interested in our offers, but nevertheless it could be said that we send out unsolicited emails.
I should point out that so far we have only used each email address once, its not like we constantly bombard these people with offers.
My question is... how do I ensure our domain name doesn't get blocked for spam? When a domain gets blocked, Is it by the entire email address (ie firstname.lastname@example.org) or just the domain (mydomain.com) name? Or is it by the IP of the mailserver?