SMTP

Stands for "Simple Mail Transfer Protocol." - an application that is used to send, receive, and relay outgoing emails between senders and receivers.

For example: you are using Gmail, so your emails are sent via Gmail SMTP. Though, Gmail limits the number of emails you can send daily, details can be found in here.

Luckily, you as a NetHunt user can use NetHunt SMTP to send UNLIMITED emails! Please check out this article to find out more about NetHunt SMTP.

SPF

SPF (Sender Policy Framework) is a signature containing information about servers that can send mail from your domain. Pretty much this is an extention of SMTP.

Let's say the postman brought a letter with delivery to the apartment, but, as a vigilant citizen, you first call the post office and ask if they have such an employee and if he can bring letters. The post office checks a list of all employees and answers. So SPF is a list of such “employees” who you trust to deliver your letters.

Once you enabled NetHunt SMTP, it is important to add NetHunt's SPF record and allow us to send emails on your behalf:

v=spf1 include:_spf.nethunt.email ~all

*Apply the following code into your DNS, please contact you email provider if you need help accessing your DNS settings.

DKIM

DKIM (DomainKeysIdentifiedMail) is a digital signature that authenticates the sender and guarantees the integrity of the delivered message. The signature is added to the service headers of the letter and is invisible to the user. DKIM stores 2 encryption keys - public and private. Using the private key, headers are formed for all outgoing mail, and the public key is just added to the DNS records in the form of a TXT file.

DKIM verification occurs automatically on the recipient's side. If the domain in the letter is not authorized to send messages, then the letter may be marked suspicious or placed in spam, depending on the recipient's policy.

If we take the same analogy with the postman, as for the SPF, then the DKIM signature will be the postman's certificate with a seal and an identification number, which can be verified by calling the post office.

To add DKIM into your DNS, please find your unique key in Settings - Email Deliverability.

Addig SPF & DKIM

Adding SPF & DKIM is extremely important when you are using your custom domain address. If you send a campaign without them, it will most probably go to SPAM, some ISPs might even block an email entirely.

This guide presents you step-by-step guide how to add SPF & DKIM on GoDaddy's example. All providers are quite similar, but if you find any difficulties adding those - it'll be best to contact your domain/email provider to help you.

SPF & DKIM check

Have you added SPF & DKIM and are willing to make sure that it's set up correctly?

Firstly, it will be shown on your account in Settings - Email Deliverability.

Also, you can do this online via this link. Just enter your domain and click "Check domain".

If you set everything correctly, you should get the following message:

Congrats! If you have added NetHunt's SPF & DKIM, you can enjoy sending UNLIMITED emails with NetHunt SMTP. Be careful with your mailing list though, spam emails are never welcomed and we might lock your account if you receive too many spam complaints.


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