# SMTP Maintenance

SMTP is used to send your customers their order related emails such as Order Confirmation, Tracking Number Assigned, Fulfillment Shipped, Refund/Void notification, and several other events.\
\
Below you will find articles for our integrated Email Service Provider plugins.

* [Sendgrid SMTP Profile](https://help.checkoutchamp.com/crm/plugins/smtp-maintenance/sendgrid-smtp-profile)
* [Maropost SMTP Profile](https://help.checkoutchamp.com/crm/plugins/smtp-maintenance/maropost-smtp-profile)
* [SMTP Maintenance Setup](https://help.checkoutchamp.com/crm/plugins/smtp-maintenance/smtp-maintenance-setup)

{% hint style="warning" %}
Be sure that your SMTP host whitelists these IP addresses:

* 44.219.22.112
* 52.206.5.84
  {% endhint %}

More autoresponder setup instructions can be found [here](https://help.checkoutchamp.com/crm/crm-setup/campaign-setup/auto-responder-setup)!