Email SMTP Partners


We provide the front-end creation and scheduling, our awesome SMTP partners deliver the content to the inbox (hopefully).  LeadByte is not an SMTP solution but our partners,, and are!

Many of our clients use LeadByte to send transactional and/OR marketing emails.  You can read more about or Email Auto Responders here.  The purpose of this article is to ensure you have everything you need to get up and running.

Best SMTP Partner?
Essentially, they all do the same thing so the choice is yours; perhaps this article helps you make a decision that is right for your business.  The most popular choice based on our clients is SendGrid.

What We Need From You
Firstly, we need the following:
- Your sending domain i.e.
- Your chosen sending account i.e.
- Your chosen reply-to email i.e. (note it can be the same as the sending)
- Your domain for tracking clicks i.e. (this is optional)

It is important that the email addresses you provide are active accounts (helps with deliverability).

Secondly, we need the SMTP credentials.  This typically includes the following:
- SMTP Host i.e.
- Port i.e. 587
- Username
- Password 

With SendGrid we just need the API key.  We advise Restricted access key with the permission Mail Send.

Please communicate the above through our ticketing system.

Managing Bounces
Each of our partners provide you with the ability to add a web hook for hard bounces, the URL's for each of our partners are below:




Replace {insert} with your account name.

Link Tracking
We automatically add LeadByte click tracking to emails.  If you want to track clicks in LeadByte using your own domain, we advise that you create a CNAME on your domain and point it to  You will require DNS access on your domain to create a CNAME for this.  We have seen an increase in deliverability when the URL links match the sending domain.

Multiple SMTP accounts
SMTP accounts can be configured at campaign (list) level, which means If you have multiple SMTP accounts you connect each SMTP account to individual campaigns in LeadByte.  For example, you may wish your Danish list to route though, your Australia list through and all other lists through

Bulk Email - Considerations/Advice
Although we are not an ESP, you have the facility to broadcast to all (or a segment) of your opt-in leads.  Much like responders, it will need to be connected to an SMTP partner of your choice.  It does not have to be the same as your responder setup either!  

We would advise that you consider the impact bulk emailing has with your IP Reputation.  In our opinion, it would be good practise to keep responder separate to bulk.  There are various points you can consider (below):

- Keep the same SMTP Partner i.e. SendGrid but have a sub account for Bulk/Responders.  If you do this, have a separate IP Address.   If you do this, make sure that unsubscribes are global (shared across both).

- Use a different SMTP Partner for Bulk/Responders.  If you do this, make sure that unsubscribes are global (shared across both).

- Keep the same SMTP Partner but add more IP Addresses to the account to load balance the sending.  If you do this, research best practise.

Your SMTP Partner however is the best sound-board for the perfect setup.



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