We wan't to send emails on behalf of one our customer. Previously we were sending those emails using our email address. But last two times we got blacklisted in SORBS database (probably because of one email is not properly added to list, but we don't know that email address). Currently we are delisted.
Now we are going to send again some emails to same list and we don't want to get blacklisted.
So we got email address of our client, client added needed SPF records to identify our server as permitted sender. So here everything is setup right way.
Question: will it helps anyhow to not get blacklisted our server in SORBS? If I understand right, SORBS use sending IP, so than it won't help. Am I right?