SMTP (Simple Mail Transfer Protocol) is the protocol used to send the email.
Usually, you can refer to the MTA (Mail Transfer Agent) with SMTP.
SMTP relay is a service that routes email through a trusted 3rd party to deliver your email. An … (more)

As is often the case, the answer to your question is: “It depends”. What is your target? What kind of message do you want to communicate? I think is correct start your strategy from this answer.

Perhaps I'm in late. However, on my side, I can suggest EmailSuccess. EmailSuccess is an advanced SMTP Server (MTA). It was built to handle the most critical reliability, performance, security, and deliverability requirements. You can find more information at https://www.emailsuccess.com/.

I don't have direct experience with this tools, but some colleagues use http://neverbounce.com/ or http://www.datavalidation.com/.

I think that we need more information to tell you something relevant. For example the volume you think you will send, if you want use SFP-DKIM-DMARC on your own domain, etc.
Anyway, I can suggest you read this article. It could clarify some … (more)

On my side, I can suggest EmailSuccess.
EmailSuccess is an advanced SMTP Server (MTA) It was built to handle the most critical reliability, performance, security, and deliverability requirements.
On the site Email Vendor Selection, you can find information about MTAs and the … (more)

SPF tells that the IP from which your email arrives is authorized to send email for your domain.
DKIM tell that your email is was not modified during the path between the sending and the delivery.
Another important technique to make more … (more)

On my side, I can suggest EmailSuccess.
EmailSuccess is an advanced SMTP Server (MTA) It was built to handle the most critical reliability, performance, security, and deliverability requirements.
On the site Email Vendor Selection, you can find information about MTAs and the … (more)