Use a Reliable ESP (Email Service Provider)

What is an ESP and why does it matter?

ESP stands for Email Service Provider.

It refers to a company that offers you all kinds of services related to sending commercial emails. It is counter advised to use a regular email address to send emails in large quantities as you may:

1. Have a limit in terms of number of emails you can send per day

2. Be flagged as spam since great amounts of emails coming from a regular mailbox seem suspicious

Gmail and Office 365 (including exchange) are the main players and are both supported by Prospect.io. You may also use your own SMTP/IMAP server.

What ESP should I choose?

The reliability of an E-mail Service Provider depends on the reputation of the IP addresses and domains of their clients. If you communicate through a shady ESP, you’ll be associated with shady IP’s and domains and your e-mails will more than likely end up in junk folders.

For that instance, we strongly recommend using the paid version of Gmail in G suite. Let’s just say that Google’s reputation is, you know, pretty good.