Test Inbox Delivery and Spam Score of a SendGrid Email Campaign

You can use the GlockApps email spam checker with any email service provider or email software to test the Inbox delivery and spam score of your email campaign before sending it to the list of real subscribers.

In this tutorial, we’re going to guide you through the steps how to use GlockApps to test the email campaigns that you send from SendGrid.

We describe two testing methods possible with SendGrid. You can choose any of the two methods that you find more convenient.

1. Testing via the Seed List

This method implies loading of the seed list (the GlockApps test email addresses) in SendGrid and sending the message to the seed list using SendGrid.

Login to your GlockApps account.

Click “Start Test”.

Test SendGrid email deliverability

Select the groups of Internet service providers and spam filters you want to test your email with and click “Next”. We recommend that you test the message with all available providers.

Select Line Break as the separator and copy the seed list.

Test SendGrid email deliverability

Open a new CSV file and paste the seed email addresses.

SendGrid requires that the email column in the CSV file has a header of “email”. To comply with it, add the column title “email” as the first row. Save the file.

Test SendGrid email deliverability

Go to your SendGrid account dashboard and click Marketing -> Contacts at the left-hand menu.

Click Add Contacts -> Upload CSV.

Test SendGrid email deliverability

Select the “Add contacts and include in a new list” option.

Type the list name, for example, “GlockApps seed list”.

Test SendGrid email deliverability

Drag and drop the CSV file or upload it from your computer.

Click “Next: Custom Fields”.

Make sure that the CSV column with the email addresses is assigned to the email field and click “Next: Add Contacts”.

Test SendGrid email deliverability

Wait until SendGrid uploads the seed list.

You can check if the email addresses are uploaded or not under Marketing -> Contacts.

Go to your GlockApps test and copy the test id.

Test SendGrid email deliverability

Open a draft or create a new email campaign in SendGrid.

Paste the id at any place in the message body or source. If you want to hide the id, you can put it in the comment tags in the source, for example,

Test SendGrid email deliverability

Send the campaign to the seed list using SendGrid.

Go to your GlockApps test and click “View Report”.

Test SendGrid email deliverability

2. Testing via Proxy Email Address

This method eliminates the need for loading the GlockApps seed list in SendGrid and pasting the test id in the message.

To use this testing method, you need to create a sending account with the SendGrid SMTP settings in GlockApps and send the message to one proxy email address associated with the sending account.

Go to Settings -> SMTP Accounts in your GlockApps dashboard.

Test SendGrid email deliverability

Click “Add Sending Account”.

Complete the fields:

Account Name – any name for your sending account
From Name – your From name
From Email – the email address that you use in SendGrid to send the message from
SMTP Server – smtp.sendgrid.net
Port – 587 (also supports 2525 without SSL)
Security Protocol – STARTTLS
SMTP Username – your SendGrid account login username
SMTP Password – your SendGrid account password

Test SendGrid email deliverability

Then select the mailbox providers you want to test your message with and click “Create sending Account”.

Copy the proxy email address associated with the sending account.

Test SendGrid email deliverability

Send the message to the proxy email address using any email system or email service provider (not necessary SendGrid).

GlockApps will re-send the message sent to the proxy email address to the entire seed list using your SendGrid SMTP settings.

Go to “Reports” at the left-hand menu in your GlockApps account and click the message subject to view the report.

In addition to manual tests, after creating a sending account, you can set up a recurring test to automate the message testing. Recurring tests are good for testing transactional emails or other emails of a high importance that must be delivered to the Inbox. Recurring tests allow to monitor the deliverability over time and quickly notice a drop in the Inbox rate.

Thanks to the API integration with SendGrid, you can use the GlockApps Bounce Monitor to track the SendGrid bounces and get the bounce email analytics in real time. The Bounce Monitor is available in the Business, Marketing and custom plans. If you want to test it, contact us.

Related Posts

Learn how DMARC Analytics digests can help you fix email authentication issues and get more emails delivered to Inbox

Getting Started with GlockApps

Equip yourself with the best tools to maximize your email marketing success. GlockApps has developed an all-in-one solution to help Read more

How to Run an Email Spam Test with GlockApps

How to Use Inbox Insight Ensure Your Emails Reach the Inbox to Improve Your Email Marketing Performance Deliverability issues can Read more

How to protect your domain with DMARC using GlockApps

How to Use DMARC Analyzer Email phishing and spoofing increased by 220% in 2021. Protect your brand from cyber attacks Read more


Julia Gulevich is an email marketing expert and customer support professional at Geminds LLC with more than 15 years of experience. Author of numerous blog posts, publications, and articles about email marketing and deliverability.