We signed up for SMTP.COM to improve our email deliverability. We were sorely dissapointed in the service we recieved. We were using them for transactional emails from our ecommerce website.
3 days ago we paid them for a month of service. We also signed up for their overpriced "Reputation Defender" service, which was supposed to notify us of email deliverability problems. But without any notice our account was cancelled, when I asked them for the reason why they did not help at all.
I also asked them for a refund of the service fees paid and they refused.
We are now forced to lodge a chargeback with our bank to recover the funds as well as having to call in someone over the weekend to repair our website's email deliverability.
So I do not recommend that anyone rely on SMTP.COM to deliver their transactional emails.