SMTP Relay Service Providers concentrate on maintaining a high IP server reputation by sending only CAN-SPAM-compliant mass email (versus spam) through the multitude of Internet Service Providers (ISPs) that make up the Internet.
Unified eMail's SMTP Relay service provides a secure, fast and reliable
The Smtp2go service deals with blacklist monitoring, reverse DNS, DKIM, ISP throttling, blocked ports, and feedback loops with major email providers such as Yahoo, AOL, and Hotmail (all of this happens behind the scenes).
An SMTP Relay Service is a process that allows you to send large volumes of email that your Internet Service Provider would not allow. Typical situations are order confirmations, account signups or email marketing campaigns.
At SMTP we’ve been doing this almost as long as the protocol’s been around. So whether you’re a developer seeking and easy-to-use, well-documented API or a marketer who just wants to get your emails in the inbox – accept no substitutes.
The two main classes of providers are SMTP Relay Services and Email Service Providers. Will a difference in cost be justified by a difference in results? To fully understand which type of provider is right for your business, it is important to understand the differences between them.